78240272 has 20 divisors (see below), whose sum is σ = 165371856. Its totient is φ = 35563680.

The previous prime is 78240241. The next prime is 78240293. The reversal of 78240272 is 27204287.

It is a happy number.

It is a super-2 number, since 2×78240272² = 12243080325267968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 222098 + ... + 222449.

Almost surely, 2^78240272 is an apocalyptic number.

It is an amenable number.

78240272 is an abundant number, since it is smaller than the sum of its proper divisors (87131584).

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

78240272 is a wasteful number, since it uses less digits than its factorization.

78240272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444566 (or 444560 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 78240272 is about 8845.3531303165. The cubic root of 78240272 is about 427.7041365161.

The spelling of 78240272 in words is "seventy-eight million, two hundred forty thousand, two hundred seventy-two".