64630720 has 224 divisors, whose sum is σ = 199558656. Its totient is φ = 19353600.

The previous prime is 64630717. The next prime is 64630733. The reversal of 64630720 is 2703646.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1059490 + ... + 1059550.

Almost surely, 2^64630720 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 64630720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99779328).

64630720 is an abundant number, since it is smaller than the sum of its proper divisors (134927936).

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

64630720 is a wasteful number, since it uses less digits than its factorization.

64630720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 64630720 is about 8039.3233546114. The cubic root of 64630720 is about 401.3097069886.

The spelling of 64630720 in words is "sixty-four million, six hundred thirty thousand, seven hundred twenty".