671521200 has 120 divisors (see below), whose sum is σ = 2458437888. Its totient is φ = 153488640.

The previous prime is 671521181. The next prime is 671521217. The reversal of 671521200 is 2125176.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31572 + ... + 48371.

Almost surely, 2^671521200 is an apocalyptic number.

671521200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

671521200 is an abundant number, since it is smaller than the sum of its proper divisors (1786916688).

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

671521200 is a wasteful number, since it uses less digits than its factorization.

671521200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79971 (or 79960 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 671521200 is about 25913.7260925557. The cubic root of 671521200 is about 875.6957513924.

Adding to 671521200 its reverse (2125176), we get a palindrome (673646376).

The spelling of 671521200 in words is "six hundred seventy-one million, five hundred twenty-one thousand, two hundred".