64439700 has 216 divisors, whose sum is σ = 213486336. Its totient is φ = 14976000.

The previous prime is 64439699. The next prime is 64439723. The reversal of 64439700 is 793446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1571680 + ... + 1571720.

Almost surely, 2^64439700 is an apocalyptic number.

64439700 is a gapful number since it is divisible by the number (60) 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 64439700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106743168).

64439700 is an abundant number, since it is smaller than the sum of its proper divisors (149046636).

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

64439700 is a wasteful number, since it uses less digits than its factorization.

64439700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 64439700 is about 8027.4342102567. The cubic root of 64439700 is about 400.9139518064.

The spelling of 64439700 in words is "sixty-four million, four hundred thirty-nine thousand, seven hundred".