78660420 has 48 divisors (see below), whose sum is σ = 223278720. Its totient is φ = 20687616.

The previous prime is 78660419. The next prime is 78660443. The reversal of 78660420 is 2406687.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4600 + ... + 13359.

It is an arithmetic number, because the mean of its divisors is an integer number (4651640).

Almost surely, 2^78660420 is an apocalyptic number.

It is an amenable number.

78660420 is an abundant number, since it is smaller than the sum of its proper divisors (144618300).

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

78660420 is a wasteful number, since it uses less digits than its factorization.

78660420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044 (or 18042 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 78660420 is about 8869.0709772783. The cubic root of 78660420 is about 428.4683564828.

The spelling of 78660420 in words is "seventy-eight million, six hundred sixty thousand, four hundred twenty".