671531520 has 160 divisors (see below), whose sum is σ = 2342260800. Its totient is φ = 162775040.

The previous prime is 671531507. The next prime is 671531533. The reversal of 671531520 is 25135176.

It is an interprime number because it is at equal distance from previous prime (671531507) and next prime (671531533).

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80506 + ... + 88454.

It is an arithmetic number, because the mean of its divisors is an integer number (14639130).

Almost surely, 2^671531520 is an apocalyptic number.

671531520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671531520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171130400).

671531520 is an abundant number, since it is smaller than the sum of its proper divisors (1670729280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671531520 is a wasteful number, since it uses less digits than its factorization.

671531520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986 (or 7970 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 671531520 is about 25913.9252140620. The cubic root of 671531520 is about 875.7002372939.

Adding to 671531520 its reverse (25135176), we get a palindrome (696666696).

The spelling of 671531520 in words is "six hundred seventy-one million, five hundred thirty-one thousand, five hundred twenty".