521682004 has 24 divisors (see below), whose sum is σ = 932705928. Its totient is φ = 255239040.

The previous prime is 521681959. The next prime is 521682011. The reversal of 521682004 is 400286125.

It can be written as a sum of positive squares in 4 ways, for example, as 91202500 + 430479504 = 9550^2 + 20748^2 .

It is a super-2 number, since 2×521682004² = 544304226594912032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42642 + ... + 53494.

It is an arithmetic number, because the mean of its divisors is an integer number (38862747).

Almost surely, 2^521682004 is an apocalyptic number.

It is an amenable number.

521682004 is a deficient number, since it is larger than the sum of its proper divisors (411023924).

521682004 is a wasteful number, since it uses less digits than its factorization.

521682004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11115 (or 11113 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 521682004 is about 22840.3591040071. The cubic root of 521682004 is about 805.0112540381.

The spelling of 521682004 in words is "five hundred twenty-one million, six hundred eighty-two thousand, four".