78567978 has 8 divisors (see below), whose sum is σ = 157135968. Its totient is φ = 26189324.

The previous prime is 78567959. The next prime is 78567991. The reversal of 78567978 is 87976587.

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

78567978 is an admirable 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, 6547326 + ... + 6547337.

It is an arithmetic number, because the mean of its divisors is an integer number (19641996).

Almost surely, 2^78567978 is an apocalyptic number.

78567978 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.

78567978 is a wasteful number, since it uses less digits than its factorization.

78567978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13094668.

The product of its digits is 5927040, while the sum is 57.

The square root of 78567978 is about 8863.8579636635. The cubic root of 78567978 is about 428.3004448531.

The spelling of 78567978 in words is "seventy-eight million, five hundred sixty-seven thousand, nine hundred seventy-eight".