78211023 has 16 divisors (see below), whose sum is σ = 116409216. Its totient is φ = 46297440.

The previous prime is 78211019. The next prime is 78211031. The reversal of 78211023 is 32011287.

It is not a de Polignac number, because 78211023 - 2² = 78211019 is a prime.

It is a super-2 number, since 2×78211023² = 12233928237413058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78210984 and 78211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78211073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26140 + ... + 28977.

It is an arithmetic number, because the mean of its divisors is an integer number (7275576).

Almost surely, 2^78211023 is an apocalyptic number.

78211023 is a deficient number, since it is larger than the sum of its proper divisors (38198193).

78211023 is a wasteful number, since it uses less digits than its factorization.

78211023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55174.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 78211023 is about 8843.6996217646. The cubic root of 78211023 is about 427.6508328607.

The spelling of 78211023 in words is "seventy-eight million, two hundred eleven thousand, twenty-three".