64400934 has 32 divisors (see below), whose sum is σ = 140283360. Its totient is φ = 19590912.

The previous prime is 64400923. The next prime is 64400939. The reversal of 64400934 is 43900446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64400939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2304 + ... + 11580.

It is an arithmetic number, because the mean of its divisors is an integer number (4383855).

Almost surely, 2^64400934 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64400934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70141680).

64400934 is an abundant number, since it is smaller than the sum of its proper divisors (75882426).

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

64400934 is a wasteful number, since it uses less digits than its factorization.

64400934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9384.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 64400934 is about 8025.0192523134. The cubic root of 64400934 is about 400.8335409837.

The spelling of 64400934 in words is "sixty-four million, four hundred thousand, nine hundred thirty-four".