78347272 has 16 divisors (see below), whose sum is σ = 147037500. Its totient is φ = 39137280.

The previous prime is 78347267. The next prime is 78347309. The reversal of 78347272 is 27274387.

It can be written as a sum of positive squares in 2 ways, for example, as 77193796 + 1153476 = 8786^2 + 1074^2 .

It is a super-2 number, since 2×78347272² = 12276590059683968, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

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, 6072 + ... + 13912.

Almost surely, 2^78347272 is an apocalyptic number.

It is an amenable number.

78347272 is a deficient number, since it is larger than the sum of its proper divisors (68690228).

78347272 is a wasteful number, since it uses less digits than its factorization.

78347272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9096 (or 9092 counting only the distinct ones).

The product of its digits is 131712, while the sum is 40.

The square root of 78347272 is about 8851.3994373771. The cubic root of 78347272 is about 427.8990212181.

The spelling of 78347272 in words is "seventy-eight million, three hundred forty-seven thousand, two hundred seventy-two".