64631616 has 112 divisors (see below), whose sum is σ = 205800960. Its totient is φ = 17487360.

The previous prime is 64631599. The next prime is 64631653. The reversal of 64631616 is 61613646.

It is a tau number, because it is divible by the number of its divisors (112).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 24271 + ... + 26801.

Almost surely, 2^64631616 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 64631616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102900480).

64631616 is an abundant number, since it is smaller than the sum of its proper divisors (141169344).

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

64631616 is a wasteful number, since it uses less digits than its factorization.

64631616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572 (or 2562 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 64631616 is about 8039.3790805012. The cubic root of 64631616 is about 401.3115614826.

The spelling of 64631616 in words is "sixty-four million, six hundred thirty-one thousand, six hundred sixteen".