78211020 has 24 divisors (see below), whose sum is σ = 218991024. Its totient is φ = 20856256.

The previous prime is 78211019. The next prime is 78211031. The reversal of 78211020 is 2011287.

It is a super-2 number, since 2×78211020² = 12233927298880800, which contains 22 as substring.

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, 651699 + ... + 651818.

It is an arithmetic number, because the mean of its divisors is an integer number (9124626).

Almost surely, 2^78211020 is an apocalyptic number.

It is an amenable number.

78211020 is an abundant number, since it is smaller than the sum of its proper divisors (140780004).

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

78211020 is a wasteful number, since it uses less digits than its factorization.

78211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303529 (or 1303527 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 78211020 is about 8843.6994521524. The cubic root of 78211020 is about 427.6508273928.

The spelling of 78211020 in words is "seventy-eight million, two hundred eleven thousand, twenty".