78823864 has 16 divisors (see below), whose sum is σ = 168908400. Its totient is φ = 33781632.

The previous prime is 78823847. The next prime is 78823897. The reversal of 78823864 is 46832887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703729 + ... + 703840.

It is an arithmetic number, because the mean of its divisors is an integer number (10556775).

Almost surely, 2^78823864 is an apocalyptic number.

It is an amenable number.

78823864 is an abundant number, since it is smaller than the sum of its proper divisors (90084536).

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

78823864 is a wasteful number, since it uses less digits than its factorization.

78823864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407582 (or 1407578 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The square root of 78823864 is about 8878.2804641439. The cubic root of 78823864 is about 428.7649144967.

The spelling of 78823864 in words is "seventy-eight million, eight hundred twenty-three thousand, eight hundred sixty-four".