64561716 has 144 divisors (see below), whose sum is σ = 184923648. Its totient is φ = 18892800.

The previous prime is 64561709. The next prime is 64561771. The reversal of 64561716 is 61716546.

64561716 is a `hidden beast` number, since 645 + 6 + 1 + 7 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 777811 + ... + 777893.

It is an arithmetic number, because the mean of its divisors is an integer number (1284192).

Almost surely, 2^64561716 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 64561716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92461824).

64561716 is an abundant number, since it is smaller than the sum of its proper divisors (120361932).

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

64561716 is a wasteful number, since it uses less digits than its factorization.

64561716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 177 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 64561716 is about 8035.0305537689. The cubic root of 64561716 is about 401.1668345995.

The spelling of 64561716 in words is "sixty-four million, five hundred sixty-one thousand, seven hundred sixteen".