671025520 has 40 divisors (see below), whose sum is σ = 1701966960. Its totient is φ = 244008960.

The previous prime is 671025503. The next prime is 671025541. The reversal of 671025520 is 25520176.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380385 + ... + 382144.

It is an arithmetic number, because the mean of its divisors is an integer number (42549174).

Almost surely, 2^671025520 is an apocalyptic number.

It is an amenable number.

671025520 is an abundant number, since it is smaller than the sum of its proper divisors (1030941440).

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

671025520 is a wasteful number, since it uses less digits than its factorization.

671025520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762553 (or 762547 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 671025520 is about 25904.1602836301. The cubic root of 671025520 is about 875.4802348831.

Adding to 671025520 its reverse (25520176), we get a palindrome (696545696).

The spelling of 671025520 in words is "six hundred seventy-one million, twenty-five thousand, five hundred twenty".