78222924 has 108 divisors (see below), whose sum is σ = 225222816. Its totient is φ = 22752576.

The previous prime is 78222883. The next prime is 78222953. The reversal of 78222924 is 42922287.

It is a happy number.

It is a super-2 number, since 2×78222924² = 12237651678219552, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 168717 + ... + 169179.

Almost surely, 2^78222924 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 78222924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112611408).

78222924 is an abundant number, since it is smaller than the sum of its proper divisors (146999892).

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

78222924 is a wasteful number, since it uses less digits than its factorization.

78222924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 500 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 78222924 is about 8844.3724480598. The cubic root of 78222924 is about 427.6725229594.

The spelling of 78222924 in words is "seventy-eight million, two hundred twenty-two thousand, nine hundred twenty-four".