864472978 has 4 divisors (see below), whose sum is σ = 1296709470. Its totient is φ = 432236488.

The previous prime is 864472969. The next prime is 864472979. The reversal of 864472978 is 879274468.

It is a happy number.

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., 684188649 + 180284329 = 26157^2 + 13427^2 .

It is not an unprimeable number, because it can be changed into a prime (864472979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216118243 + ... + 216118246.

Almost surely, 2^864472978 is an apocalyptic number.

864472978 is a deficient number, since it is larger than the sum of its proper divisors (432236492).

864472978 is a wasteful number, since it uses less digits than its factorization.

864472978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432236491.

The product of its digits is 5419008, while the sum is 55.

The square root of 864472978 is about 29401.9213317769. The cubic root of 864472978 is about 952.6143971097.

The spelling of 864472978 in words is "eight hundred sixty-four million, four hundred seventy-two thousand, nine hundred seventy-eight".