64642404 has 96 divisors (see below), whose sum is σ = 164094336. Its totient is φ = 19768320.

The previous prime is 64642379. The next prime is 64642423. The reversal of 64642404 is 40424646.

It is a super-3 number, since 3×64642404³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a nontrivial repunit in base 401.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 964779 + ... + 964845.

It is an arithmetic number, because the mean of its divisors is an integer number (1709316).

Almost surely, 2^64642404 is an apocalyptic number.

It is an amenable number.

64642404 is an abundant number, since it is smaller than the sum of its proper divisors (99451932).

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

64642404 is a wasteful number, since it uses less digits than its factorization.

64642404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 64642404 is about 8040.0499998445. The cubic root of 64642404 is about 401.3338885754. Note that the first 3 decimals are identical.

The spelling of 64642404 in words is "sixty-four million, six hundred forty-two thousand, four hundred four".