78245420 has 48 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 26953920.

The previous prime is 78245411. The next prime is 78245443. The reversal of 78245420 is 2454287.

It is a super-2 number, since 2×78245420² = 12244691501952800, which contains 22 as substring.

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, 5180 + ... + 13539.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^78245420 is an apocalyptic number.

It is an amenable number.

78245420 is an abundant number, since it is smaller than the sum of its proper divisors (110452180).

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

78245420 is a wasteful number, since it uses less digits than its factorization.

78245420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18758 (or 18756 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 78245420 is about 8845.6441257830. The cubic root of 78245420 is about 427.7135169053.

The spelling of 78245420 in words is "seventy-eight million, two hundred forty-five thousand, four hundred twenty".