78855828 has 12 divisors (see below), whose sum is σ = 183996960. Its totient is φ = 26285272.

The previous prime is 78855827. The next prime is 78855839. The reversal of 78855828 is 82855887.

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 (78855827) 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, 3285648 + ... + 3285671.

It is an arithmetic number, because the mean of its divisors is an integer number (15333080).

Almost surely, 2^78855828 is an apocalyptic number.

It is an amenable number.

78855828 is an abundant number, since it is smaller than the sum of its proper divisors (105141132).

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

78855828 is a wasteful number, since it uses less digits than its factorization.

78855828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6571326 (or 6571324 counting only the distinct ones).

The product of its digits is 1433600, while the sum is 51.

The square root of 78855828 is about 8880.0804050414. The cubic root of 78855828 is about 428.8228630626.

It can be divided in two parts, 788 and 55828, that added together give a triangular number (56616 = T₃₃₆).

The spelling of 78855828 in words is "seventy-eight million, eight hundred fifty-five thousand, eight hundred twenty-eight".