78690408 has 32 divisors (see below), whose sum is σ = 200914560. Its totient is φ = 25671680.

The previous prime is 78690401. The next prime is 78690461. The reversal of 78690408 is 80409687.

It is a happy number.

It is a super-2 number, since 2×78690408² = 12384360622412928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78690408.

It is not an unprimeable number, because it can be changed into a prime (78690401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33753 + ... + 36008.

It is an arithmetic number, because the mean of its divisors is an integer number (6278580).

Almost surely, 2^78690408 is an apocalyptic number.

It is an amenable number.

78690408 is an abundant number, since it is smaller than the sum of its proper divisors (122224152).

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

78690408 is a wasteful number, since it uses less digits than its factorization.

78690408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69817 (or 69813 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 78690408 is about 8870.7614103864. The cubic root of 78690408 is about 428.5227984186.

The spelling of 78690408 in words is "seventy-eight million, six hundred ninety thousand, four hundred eight".