78621192 has 224 divisors, whose sum is σ = 256155480. Its totient is φ = 22394880.

The previous prime is 78621181. The next prime is 78621197. The reversal of 78621192 is 29112687.

It can be written as a sum of positive squares in 4 ways, for example, as 42693156 + 35928036 = 6534^2 + 5994^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (12096) is a multiple of the sum of its prime divisors (96).

It is not an unprimeable number, because it can be changed into a prime (78621197) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1288842 + ... + 1288902.

Almost surely, 2^78621192 is an apocalyptic number.

78621192 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78621192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128077740).

78621192 is an abundant number, since it is smaller than the sum of its proper divisors (177534288).

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

78621192 is a wasteful number, since it uses less digits than its factorization.

78621192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 96 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 78621192 is about 8866.8591959047. The cubic root of 78621192 is about 428.3971188282.

The spelling of 78621192 in words is "seventy-eight million, six hundred twenty-one thousand, one hundred ninety-two".