78746978 has 8 divisors (see below), whose sum is σ = 121001580. Its totient is φ = 38413120.

The previous prime is 78746959. The next prime is 78747047. The reversal of 78746978 is 87964787.

It can be written as a sum of positive squares in 2 ways, for example, as 76335169 + 2411809 = 8737^2 + 1553^2 .

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

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, 480083 + ... + 480246.

Almost surely, 2^78746978 is an apocalyptic number.

78746978 is a deficient number, since it is larger than the sum of its proper divisors (42254602).

78746978 is a wasteful number, since it uses less digits than its factorization.

78746978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960372.

The product of its digits is 4741632, while the sum is 56.

The square root of 78746978 is about 8873.9494026054. The cubic root of 78746978 is about 428.6254611981.

The spelling of 78746978 in words is "seventy-eight million, seven hundred forty-six thousand, nine hundred seventy-eight".