64694556 has 72 divisors (see below), whose sum is σ = 170889264. Its totient is φ = 20616960.

The previous prime is 64694549. The next prime is 64694557. The reversal of 64694556 is 65549646.

64694556 is a `hidden beast` number, since 6 + 4 + 6 + 94 + 556 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64694557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77815 + ... + 78641.

It is an arithmetic number, because the mean of its divisors is an integer number (2373462).

Almost surely, 2^64694556 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 64694556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85444632).

64694556 is an abundant number, since it is smaller than the sum of its proper divisors (106194708).

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

64694556 is a wasteful number, since it uses less digits than its factorization.

64694556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 926 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 64694556 is about 8043.2926093734. The cubic root of 64694556 is about 401.4417885372.

It can be divided in two parts, 6469 and 4556, that added together give a square (11025 = 105²).

The spelling of 64694556 in words is "sixty-four million, six hundred ninety-four thousand, five hundred fifty-six".