78400108 has 12 divisors (see below), whose sum is σ = 141931440. Its totient is φ = 37848272.

The previous prime is 78400087. The next prime is 78400121. The reversal of 78400108 is 80100487.

It is a super-2 number, since 2×78400108² = 12293153868823328, which contains 22 as substring.

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, 337816 + ... + 338047.

It is an arithmetic number, because the mean of its divisors is an integer number (11827620).

Almost surely, 2^78400108 is an apocalyptic number.

It is an amenable number.

78400108 is a deficient number, since it is larger than the sum of its proper divisors (63531332).

78400108 is a wasteful number, since it uses less digits than its factorization.

78400108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675896 (or 675894 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 78400108 is about 8854.3835471477. The cubic root of 78400108 is about 427.9951887543.

The spelling of 78400108 in words is "seventy-eight million, four hundred thousand, one hundred eight".