78980978 has 8 divisors (see below), whose sum is σ = 122556780. Its totient is φ = 38128720.

The previous prime is 78980939. The next prime is 78981029. The reversal of 78980978 is 87908987.

It can be written as a sum of positive squares in 2 ways, for example, as 78978769 + 2209 = 8887^2 + 47^2 .

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, 680813 + ... + 680928.

Almost surely, 2^78980978 is an apocalyptic number.

78980978 is a deficient number, since it is larger than the sum of its proper divisors (43575802).

78980978 is a wasteful number, since it uses less digits than its factorization.

78980978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361772.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The square root of 78980978 is about 8887.1242817910. The cubic root of 78980978 is about 429.0496009649.

The spelling of 78980978 in words is "seventy-eight million, nine hundred eighty thousand, nine hundred seventy-eight".