78921150 has 96 divisors (see below), whose sum is σ = 244055808. Its totient is φ = 16396800.

The previous prime is 78921149. The next prime is 78921163. The reversal of 78921150 is 5112987.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8134 + ... + 14966.

It is an arithmetic number, because the mean of its divisors is an integer number (2542248).

Almost surely, 2^78921150 is an apocalyptic number.

78921150 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78921150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122027904).

78921150 is an abundant number, since it is smaller than the sum of its proper divisors (165134658).

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

78921150 is a wasteful number, since it uses less digits than its factorization.

78921150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6866 (or 6861 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 78921150 is about 8883.7576509043. The cubic root of 78921150 is about 428.9412387391.

The spelling of 78921150 in words is "seventy-eight million, nine hundred twenty-one thousand, one hundred fifty".