78605220 has 24 divisors (see below), whose sum is σ = 220094784. Its totient is φ = 20961376.

The previous prime is 78605207. The next prime is 78605239. The reversal of 78605220 is 2250687.

It is a super-2 number, since 2×78605220² = 12357561222496800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654984 + ... + 655103.

It is an arithmetic number, because the mean of its divisors is an integer number (9170616).

Almost surely, 2^78605220 is an apocalyptic number.

It is an amenable number.

78605220 is an abundant number, since it is smaller than the sum of its proper divisors (141489564).

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

78605220 is a wasteful number, since it uses less digits than its factorization.

78605220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310099 (or 1310097 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78605220 is about 8865.9584930226. The cubic root of 78605220 is about 428.3681070482.

The spelling of 78605220 in words is "seventy-eight million, six hundred five thousand, two hundred twenty".