402490706128 has 120 divisors (see below), whose sum is σ = 911421540288. Its totient is φ = 168636754944.

The previous prime is 402490706081. The next prime is 402490706153. The reversal of 402490706128 is 821607094204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 650227003 + ... + 650227621.

Almost surely, 2^402490706128 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 402490706128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455710770144).

402490706128 is an abundant number, since it is smaller than the sum of its proper divisors (508930834160).

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

402490706128 is an equidigital number, since it uses as much as digits as its factorization.

402490706128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 402490706128 in words is "four hundred two billion, four hundred ninety million, seven hundred six thousand, one hundred twenty-eight".