8642978 has 8 divisors (see below), whose sum is σ = 13314972. Its totient is φ = 4204656.

The previous prime is 8642951. The next prime is 8642989. The reversal of 8642978 is 8792468.

It can be written as a sum of positive squares in 2 ways, for example, as 8369449 + 273529 = 2893^2 + 523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58325 + ... + 58472.

Almost surely, 2^8642978 is an apocalyptic number.

8642978 is a deficient number, since it is larger than the sum of its proper divisors (4671994).

8642978 is a wasteful number, since it uses less digits than its factorization.

8642978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116836.

The product of its digits is 193536, while the sum is 44.

The square root of 8642978 is about 2939.8942157840. The cubic root of 8642978 is about 205.2206863948.

It can be divided in two parts, 8 and 642978, that multiplied together give a square (5143824 = 2268²).

The spelling of 8642978 in words is "eight million, six hundred forty-two thousand, nine hundred seventy-eight".