64400234 has 24 divisors (see below), whose sum is σ = 102705408. Its totient is φ = 30280680.

The previous prime is 64400227. The next prime is 64400243. The reversal of 64400234 is 43200446.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137669 + ... + 138135.

It is an arithmetic number, because the mean of its divisors is an integer number (4279392).

Almost surely, 2^64400234 is an apocalyptic number.

64400234 is a deficient number, since it is larger than the sum of its proper divisors (38305174).

64400234 is a wasteful number, since it uses less digits than its factorization.

64400234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 64400234 is about 8024.9756385923. The cubic root of 64400234 is about 400.8320887041.

The spelling of 64400234 in words is "sixty-four million, four hundred thousand, two hundred thirty-four".