78406224 has 40 divisors (see below), whose sum is σ = 218131872. Its totient is φ = 24124800.

The previous prime is 78406201. The next prime is 78406249. The reversal of 78406224 is 42260487.

It is a super-2 number, since 2×78406224² = 12295071923876352, which contains 22 as substring.

It is a congruent number.

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, 62202 + ... + 63449.

Almost surely, 2^78406224 is an apocalyptic number.

It is an amenable number.

78406224 is an abundant number, since it is smaller than the sum of its proper divisors (139725648).

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

78406224 is a wasteful number, since it uses less digits than its factorization.

78406224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125675 (or 125669 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 78406224 is about 8854.7289060705. The cubic root of 78406224 is about 428.0063177802.

The spelling of 78406224 in words is "seventy-eight million, four hundred six thousand, two hundred twenty-four".