78418866 has 16 divisors (see below), whose sum is σ = 157183488. Its totient is φ = 26082000.

The previous prime is 78418843. The next prime is 78418897. The reversal of 78418866 is 66881487.

It is a super-2 number, since 2×78418866² = 12299037089451912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11410 + ... + 16941.

It is an arithmetic number, because the mean of its divisors is an integer number (9823968).

Almost surely, 2^78418866 is an apocalyptic number.

78418866 is an abundant number, since it is smaller than the sum of its proper divisors (78764622).

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

78418866 is a wasteful number, since it uses less digits than its factorization.

78418866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28817.

The product of its digits is 516096, while the sum is 48.

The square root of 78418866 is about 8855.4427331444. The cubic root of 78418866 is about 428.0293200574.

The spelling of 78418866 in words is "seventy-eight million, four hundred eighteen thousand, eight hundred sixty-six".