972218656 has 12 divisors (see below), whose sum is σ = 1914055542. Its totient is φ = 486109312.

The previous prime is 972218651. The next prime is 972218659. The reversal of 972218656 is 656812279.

It can be written as a sum of positive squares in only one way, i.e., 724471056 + 247747600 = 26916^2 + 15740^2 .

It is not an unprimeable number, because it can be changed into a prime (972218651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15190885 + ... + 15190948.

Almost surely, 2^972218656 is an apocalyptic number.

It is an amenable number.

972218656 is a deficient number, since it is larger than the sum of its proper divisors (941836886).

972218656 is a wasteful number, since it uses less digits than its factorization.

972218656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30381843 (or 30381835 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 972218656 is about 31180.4210362849. The cubic root of 972218656 is about 990.6524475154.

The spelling of 972218656 in words is "nine hundred seventy-two million, two hundred eighteen thousand, six hundred fifty-six".