78273172 has 6 divisors (see below), whose sum is σ = 136978058. Its totient is φ = 39136584.

The previous prime is 78273157. The next prime is 78273197. The reversal of 78273172 is 27137287.

It can be written as a sum of positive squares in only one way, i.e., 76842756 + 1430416 = 8766^2 + 1196^2 .

It is a super-2 number, since 2×78273172² = 12253378909883168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9784143 + ... + 9784150.

Almost surely, 2^78273172 is an apocalyptic number.

It is an amenable number.

78273172 is a deficient number, since it is larger than the sum of its proper divisors (58704886).

78273172 is a wasteful number, since it uses less digits than its factorization.

78273172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19568297 (or 19568295 counting only the distinct ones).

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

The square root of 78273172 is about 8847.2126684058. The cubic root of 78273172 is about 427.7640779156.

The spelling of 78273172 in words is "seventy-eight million, two hundred seventy-three thousand, one hundred seventy-two".