972818866 has 4 divisors (see below), whose sum is σ = 1459228302. Its totient is φ = 486409432.

The previous prime is 972818839. The next prime is 972818887. The reversal of 972818866 is 668818279.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 777238641 + 195580225 = 27879^2 + 13985^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 243204715 + ... + 243204718.

Almost surely, 2^972818866 is an apocalyptic number.

972818866 is a deficient number, since it is larger than the sum of its proper divisors (486409436).

972818866 is a wasteful number, since it uses less digits than its factorization.

972818866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486409435.

The product of its digits is 2322432, while the sum is 55.

The square root of 972818866 is about 31190.0443411035. The cubic root of 972818866 is about 990.8562690128.

The spelling of 972818866 in words is "nine hundred seventy-two million, eight hundred eighteen thousand, eight hundred sixty-six".