78089172 has 48 divisors (see below), whose sum is σ = 208736640. Its totient is φ = 22257792.

The previous prime is 78089149. The next prime is 78089191. The reversal of 78089172 is 27198087.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45954 + ... + 47622.

It is an arithmetic number, because the mean of its divisors is an integer number (4348680).

Almost surely, 2^78089172 is an apocalyptic number.

It is an amenable number.

78089172 is an abundant number, since it is smaller than the sum of its proper divisors (130647468).

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

78089172 is a wasteful number, since it uses less digits than its factorization.

78089172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240 (or 2238 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 78089172 is about 8836.8077946734. The cubic root of 78089172 is about 427.4286273242.

The spelling of 78089172 in words is "seventy-eight million, eighty-nine thousand, one hundred seventy-two".