64966720 has 224 divisors, whose sum is σ = 200729088. Its totient is φ = 19464192.

The previous prime is 64966703. The next prime is 64966753. The reversal of 64966720 is 2766946.

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 (40).

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, 669712 + ... + 669808.

It is an arithmetic number, because the mean of its divisors is an integer number (896112).

Almost surely, 2^64966720 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 64966720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100364544).

64966720 is an abundant number, since it is smaller than the sum of its proper divisors (135762368).

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

64966720 is a wasteful number, since it uses less digits than its factorization.

64966720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 64966720 is about 8060.1935460633. The cubic root of 64966720 is about 402.0039437581.

The spelling of 64966720 in words is "sixty-four million, nine hundred sixty-six thousand, seven hundred twenty".