64433408 has 72 divisors (see below), whose sum is σ = 145941600. Its totient is φ = 28145664.

The previous prime is 64433399. The next prime is 64433441. The reversal of 64433408 is 80433446.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62723 + ... + 63741.

Almost surely, 2^64433408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64433408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72970800).

64433408 is an abundant number, since it is smaller than the sum of its proper divisors (81508192).

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

64433408 is a wasteful number, since it uses less digits than its factorization.

64433408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 64433408 is about 8027.0422946438. The cubic root of 64433408 is about 400.9009027456.

The spelling of 64433408 in words is "sixty-four million, four hundred thirty-three thousand, four hundred eight".