8613978 has 8 divisors (see below), whose sum is σ = 17227968. Its totient is φ = 2871324.

The previous prime is 8613967. The next prime is 8614003. The reversal of 8613978 is 8793168.

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

8613978 is an admirable number.

It is an Ulam number.

It is a Curzon number.

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, 717826 + ... + 717837.

It is an arithmetic number, because the mean of its divisors is an integer number (2153496).

Almost surely, 2^8613978 is an apocalyptic number.

8613978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8613978 is a wasteful number, since it uses less digits than its factorization.

8613978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435668.

The product of its digits is 72576, while the sum is 42.

The square root of 8613978 is about 2934.9579213338. The cubic root of 8613978 is about 204.9909018369.

It can be divided in two parts, 8613 and 978, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 8613978 in words is "eight million, six hundred thirteen thousand, nine hundred seventy-eight".