78216439023 has 16 divisors (see below), whose sum is σ = 119871938400. Its totient is φ = 50346213120.

The previous prime is 78216439013. The next prime is 78216439027. The reversal of 78216439023 is 32093461287.

78216439023 is a `hidden beast` number, since 7 + 82 + 164 + 390 + 23 = 666.

It is not a de Polignac number, because 78216439023 - 2⁶ = 78216438959 is a prime.

It is a super-2 number, since 2×78216439023² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78216439023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78216439027) 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, 49945858 + ... + 49947423.

It is an arithmetic number, because the mean of its divisors is an integer number (7491996150).

Almost surely, 2^78216439023 is an apocalyptic number.

78216439023 is a deficient number, since it is larger than the sum of its proper divisors (41655499377).

78216439023 is a wasteful number, since it uses less digits than its factorization.

78216439023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99893319 (or 99893313 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 78216439023 in words is "seventy-eight billion, two hundred sixteen million, four hundred thirty-nine thousand, twenty-three".