78785844 has 12 divisors (see below), whose sum is σ = 183833664. Its totient is φ = 26261944.

The previous prime is 78785843. The next prime is 78785851. The reversal of 78785844 is 44858787.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78785843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3282732 + ... + 3282755.

It is an arithmetic number, because the mean of its divisors is an integer number (15319472).

Almost surely, 2^78785844 is an apocalyptic number.

It is an amenable number.

78785844 is an abundant number, since it is smaller than the sum of its proper divisors (105047820).

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

78785844 is a wasteful number, since it uses less digits than its factorization.

78785844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6565494 (or 6565492 counting only the distinct ones).

The product of its digits is 2007040, while the sum is 51.

The square root of 78785844 is about 8876.1390254998. The cubic root of 78785844 is about 428.6959664104.

The spelling of 78785844 in words is "seventy-eight million, seven hundred eighty-five thousand, eight hundred forty-four".