78538224 has 20 divisors (see below), whose sum is σ = 202890536. Its totient is φ = 26179392.

The previous prime is 78538223. The next prime is 78538231. The reversal of 78538224 is 42283587.

It is a super-3 number, since 3×78538224³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78538223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818059 + ... + 818154.

Almost surely, 2^78538224 is an apocalyptic number.

It is an amenable number.

78538224 is an abundant number, since it is smaller than the sum of its proper divisors (124352312).

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

78538224 is a wasteful number, since it uses less digits than its factorization.

78538224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636224 (or 1636218 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 78538224 is about 8862.1794159225. The cubic root of 78538224 is about 428.2463716764.

The spelling of 78538224 in words is "seventy-eight million, five hundred thirty-eight thousand, two hundred twenty-four".