402688439664 has 160 divisors (see below), whose sum is σ = 1211832866304. Its totient is φ = 112835374080.

The previous prime is 402688439653. The next prime is 402688439687. The reversal of 402688439664 is 466934886204.

It is a junction number, because it is equal to n+sod(n) for n = 402688439598 and 402688439607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77871799 + ... + 77876969.

Almost surely, 2^402688439664 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 402688439664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (605916433152).

402688439664 is an abundant number, since it is smaller than the sum of its proper divisors (809144426640).

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

402688439664 is a wasteful number, since it uses less digits than its factorization.

402688439664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9615 (or 9609 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 60.

The spelling of 402688439664 in words is "four hundred two billion, six hundred eighty-eight million, four hundred thirty-nine thousand, six hundred sixty-four".