78817272 has 32 divisors (see below), whose sum is σ = 197260800. Its totient is φ = 26243424.

The previous prime is 78817267. The next prime is 78817337. The reversal of 78817272 is 27271887.

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, 41283 + ... + 43149.

It is an arithmetic number, because the mean of its divisors is an integer number (6164400).

Almost surely, 2^78817272 is an apocalyptic number.

It is an amenable number.

78817272 is an abundant number, since it is smaller than the sum of its proper divisors (118443528).

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

78817272 is a wasteful number, since it uses less digits than its factorization.

78817272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635 (or 3631 counting only the distinct ones).

The product of its digits is 87808, while the sum is 42.

The square root of 78817272 is about 8877.9092133227. The cubic root of 78817272 is about 428.7529616990.

The spelling of 78817272 in words is "seventy-eight million, eight hundred seventeen thousand, two hundred seventy-two".