402790656 has 72 divisors (see below), whose sum is σ = 1135106784. Its totient is φ = 126361600.

The previous prime is 402790637. The next prime is 402790669. The reversal of 402790656 is 656097204.

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, 2370 + ... + 28481.

It is an arithmetic number, because the mean of its divisors is an integer number (15765372).

Almost surely, 2^402790656 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 402790656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (567553392).

402790656 is an abundant number, since it is smaller than the sum of its proper divisors (732316128).

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

402790656 is a wasteful number, since it uses less digits than its factorization.

402790656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30887 (or 30873 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 402790656 is about 20069.6451388658. The cubic root of 402790656 is about 738.5158077638.

The spelling of 402790656 in words is "four hundred two million, seven hundred ninety thousand, six hundred fifty-six".