402136064 has 88 divisors (see below), whose sum is σ = 923606400. Its totient is φ = 173076480.

The previous prime is 402136051. The next prime is 402136073. The reversal of 402136064 is 460631204.

It is a tau number, because it is divible by the number of its divisors (88).

It is a congruent number.

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, 213077 + ... + 214955.

Almost surely, 2^402136064 is an apocalyptic number.

402136064 is a gapful number since it is divisible by the number (44) 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 402136064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461803200).

402136064 is an abundant number, since it is smaller than the sum of its proper divisors (521470336).

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

402136064 is a wasteful number, since it uses less digits than its factorization.

402136064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929 (or 1911 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 402136064 is about 20053.3304964537. The cubic root of 402136064 is about 738.1155265027.

Adding to 402136064 its reverse (460631204), we get a palindrome (862767268).

The spelling of 402136064 in words is "four hundred two million, one hundred thirty-six thousand, sixty-four".