521751672 has 96 divisors (see below), whose sum is σ = 1569481200. Its totient is φ = 160527744.

The previous prime is 521751649. The next prime is 521751679. The reversal of 521751672 is 276157125.

521751672 is a `hidden beast` number, since 521 + 75 + 1 + 67 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521751679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29358 + ... + 43650.

Almost surely, 2^521751672 is an apocalyptic number.

521751672 is a gapful number since it is divisible by the number (52) 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 521751672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784740600).

521751672 is an abundant number, since it is smaller than the sum of its proper divisors (1047729528).

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

521751672 is a wasteful number, since it uses less digits than its factorization.

521751672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14334 (or 14311 counting only the distinct ones).

The product of its digits is 29400, while the sum is 36.

The square root of 521751672 is about 22841.8841604628. The cubic root of 521751672 is about 805.0470875071.

The spelling of 521751672 in words is "five hundred twenty-one million, seven hundred fifty-one thousand, six hundred seventy-two".