78502020 has 24 divisors (see below), whose sum is σ = 219805824. Its totient is φ = 20933856.

The previous prime is 78501989. The next prime is 78502033. The reversal of 78502020 is 2020587.

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, 654124 + ... + 654243.

It is an arithmetic number, because the mean of its divisors is an integer number (9158576).

Almost surely, 2^78502020 is an apocalyptic number.

It is an amenable number.

78502020 is an abundant number, since it is smaller than the sum of its proper divisors (141303804).

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

78502020 is a wasteful number, since it uses less digits than its factorization.

78502020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308379 (or 1308377 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 78502020 is about 8860.1365677962. The cubic root of 78502020 is about 428.1805582258.

It can be divided in two parts, 7850 and 2020, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 78502020 in words is "seventy-eight million, five hundred two thousand, twenty".