64631716 has 6 divisors (see below), whose sum is σ = 113105510. Its totient is φ = 32315856.

The previous prime is 64631713. The next prime is 64631729. The reversal of 64631716 is 61713646.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 9278116 = 7440^2 + 3046^2 .

It is not an unprimeable number, because it can be changed into a prime (64631713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8078961 + ... + 8078968.

Almost surely, 2^64631716 is an apocalyptic number.

It is an amenable number.

64631716 is a deficient number, since it is larger than the sum of its proper divisors (48473794).

64631716 is a wasteful number, since it uses less digits than its factorization.

64631716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16157933 (or 16157931 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 64631716 is about 8039.3852998846. The cubic root of 64631716 is about 401.3117684563.

The spelling of 64631716 in words is "sixty-four million, six hundred thirty-one thousand, seven hundred sixteen".