78579823 has 16 divisors (see below), whose sum is σ = 95217664. Its totient is φ = 63413280.

The previous prime is 78579803. The next prime is 78579827. The reversal of 78579823 is 32897587.

It is a de Polignac number, because none of the positive numbers 2^k-78579823 is a prime.

It is a super-2 number, since 2×78579823² = 12349577165422658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78579827) 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, 3136 + ... + 12922.

It is an arithmetic number, because the mean of its divisors is an integer number (5951104).

Almost surely, 2^78579823 is an apocalyptic number.

78579823 is a deficient number, since it is larger than the sum of its proper divisors (16637841).

78579823 is a wasteful number, since it uses less digits than its factorization.

78579823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9862.

The product of its digits is 846720, while the sum is 49.

The square root of 78579823 is about 8864.5261012645. The cubic root of 78579823 is about 428.3219674631.

It can be divided in two parts, 785 and 79823, that added together give a palindrome (80608).

The spelling of 78579823 in words is "seventy-eight million, five hundred seventy-nine thousand, eight hundred twenty-three".