78225912 has 80 divisors (see below), whose sum is σ = 222809400. Its totient is φ = 25634880.

The previous prime is 78225893. The next prime is 78225913. The reversal of 78225912 is 21952287.

It is a super-2 number, since 2×78225912² = 12238586616463488, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78225913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38539 + ... + 40517.

Almost surely, 2^78225912 is an apocalyptic number.

78225912 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 78225912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111404700).

78225912 is an abundant number, since it is smaller than the sum of its proper divisors (144583488).

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

78225912 is a wasteful number, since it uses less digits than its factorization.

78225912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058 (or 2045 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 78225912 is about 8844.5413674198. The cubic root of 78225912 is about 427.6779683760.

The spelling of 78225912 in words is "seventy-eight million, two hundred twenty-five thousand, nine hundred twelve".