718215664 has 40 divisors (see below), whose sum is σ = 1457219232. Its totient is φ = 342270720.

The previous prime is 718215661. The next prime is 718215689. The reversal of 718215664 is 466512817.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718215661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104494 + ... + 111154.

Almost surely, 2^718215664 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 718215664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728609616).

718215664 is an abundant number, since it is smaller than the sum of its proper divisors (739003568).

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

718215664 is a wasteful number, since it uses less digits than its factorization.

718215664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985 (or 6979 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 718215664 is about 26799.5459663032. The cubic root of 718215664 is about 895.5399357419.

The spelling of 718215664 in words is "seven hundred eighteen million, two hundred fifteen thousand, six hundred sixty-four".