64433664 has 160 divisors (see below), whose sum is σ = 196416000. Its totient is φ = 20846592.

The previous prime is 64433653. The next prime is 64433671. The reversal of 64433664 is 46633446.

64433664 is a `hidden beast` number, since 644 + 3 + 3 + 6 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 815577 + ... + 815655.

It is an arithmetic number, because the mean of its divisors is an integer number (1227600).

Almost surely, 2^64433664 is an apocalyptic number.

64433664 is a gapful number since it is divisible by the number (64) 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 64433664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98208000).

64433664 is an abundant number, since it is smaller than the sum of its proper divisors (131982336).

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

64433664 is an equidigital number, since it uses as much as digits as its factorization.

64433664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 143 counting only the distinct ones).

The product of its digits is 124416, while the sum is 36.

The square root of 64433664 is about 8027.0582407256. The cubic root of 64433664 is about 400.9014336839.

The spelling of 64433664 in words is "sixty-four million, four hundred thirty-three thousand, six hundred sixty-four".