64477688 has 32 divisors (see below), whose sum is σ = 133706160. Its totient is φ = 28903680.

The previous prime is 64477681. The next prime is 64477703. The reversal of 64477688 is 88677446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64477681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1406 + ... + 11442.

Almost surely, 2^64477688 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 64477688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66853080).

64477688 is an abundant number, since it is smaller than the sum of its proper divisors (69228472).

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

64477688 is a wasteful number, since it uses less digits than its factorization.

64477688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10127 (or 10123 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 50.

The square root of 64477688 is about 8029.7999975093. The cubic root of 64477688 is about 400.9927175747.

The spelling of 64477688 in words is "sixty-four million, four hundred seventy-seven thousand, six hundred eighty-eight".