78223872 has 80 divisors (see below), whose sum is σ = 210557952. Its totient is φ = 25804800.

The previous prime is 78223843. The next prime is 78223891. The reversal of 78223872 is 27832287.

It is a super-2 number, since 2×78223872² = 12237948301344768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78223872.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194872 + ... + 195272.

Almost surely, 2^78223872 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 78223872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105278976).

78223872 is an abundant number, since it is smaller than the sum of its proper divisors (132334080).

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

78223872 is a wasteful number, since it uses less digits than its factorization.

78223872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549 (or 533 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 78223872 is about 8844.4260412986. The cubic root of 78223872 is about 427.6742506367.

The spelling of 78223872 in words is "seventy-eight million, two hundred twenty-three thousand, eight hundred seventy-two".