521070408 has 160 divisors (see below), whose sum is σ = 1520650560. Its totient is φ = 166561920.

The previous prime is 521070397. The next prime is 521070439. The reversal of 521070408 is 804070125.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2469423 + ... + 2469633.

It is an arithmetic number, because the mean of its divisors is an integer number (9504066).

Almost surely, 2^521070408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521070408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (760325280).

521070408 is an abundant number, since it is smaller than the sum of its proper divisors (999580152).

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

521070408 is a wasteful number, since it uses less digits than its factorization.

521070408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 521070408 is about 22826.9666841655. The cubic root of 521070408 is about 804.6965449598.

The spelling of 521070408 in words is "five hundred twenty-one million, seventy thousand, four hundred eight".