8638978 has 4 divisors (see below), whose sum is σ = 12958470. Its totient is φ = 4319488.

The previous prime is 8638967. The next prime is 8638991. The reversal of 8638978 is 8798368.

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., 8025889 + 613089 = 2833^2 + 783^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2159743 + ... + 2159746.

Almost surely, 2^8638978 is an apocalyptic number.

8638978 is a deficient number, since it is larger than the sum of its proper divisors (4319492).

8638978 is a wasteful number, since it uses less digits than its factorization.

8638978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319491.

The product of its digits is 580608, while the sum is 49.

The square root of 8638978 is about 2939.2138404682. The cubic root of 8638978 is about 205.1890225626.

The spelling of 8638978 in words is "eight million, six hundred thirty-eight thousand, nine hundred seventy-eight".