78225588 has 72 divisors (see below), whose sum is σ = 234375232. Its totient is φ = 22348224.

The previous prime is 78225569. The next prime is 78225601. The reversal of 78225588 is 88552287.

78225588 is a `hidden beast` number, since 78 + 22 + 558 + 8 = 666.

It is a super-2 number, since 2×78225588² = 12238485235891488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1056 + ... + 12552.

Almost surely, 2^78225588 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78225588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117187616).

78225588 is an abundant number, since it is smaller than the sum of its proper divisors (156149644).

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

78225588 is a wasteful number, since it uses less digits than its factorization.

78225588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11523 (or 11509 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 78225588 is about 8844.5230510186. The cubic root of 78225588 is about 427.6773779159.

The spelling of 78225588 in words is "seventy-eight million, two hundred twenty-five thousand, five hundred eighty-eight".