78731272 has 16 divisors (see below), whose sum is σ = 147733740. Its totient is φ = 39335616.

The previous prime is 78731221. The next prime is 78731291. The reversal of 78731272 is 27213787.

It can be written as a sum of positive squares in 2 ways, for example, as 78605956 + 125316 = 8866^2 + 354^2 .

It is a super-2 number, since 2×78731272² = 12397226381475968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10638 + ... + 16450.

Almost surely, 2^78731272 is an apocalyptic number.

It is an amenable number.

78731272 is a deficient number, since it is larger than the sum of its proper divisors (69002468).

78731272 is a wasteful number, since it uses less digits than its factorization.

78731272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7512 (or 7508 counting only the distinct ones).

The product of its digits is 32928, while the sum is 37.

The square root of 78731272 is about 8873.0644086471. The cubic root of 78731272 is about 428.5969630077.

It can be divided in two parts, 78731 and 272, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 78731272 in words is "seventy-eight million, seven hundred thirty-one thousand, two hundred seventy-two".