78268275 has 30 divisors (see below), whose sum is σ = 144983652. Its totient is φ = 41742000.

The previous prime is 78268271. The next prime is 78268321. The reversal of 78268275 is 57286287.

It is not a de Polignac number, because 78268275 - 2² = 78268271 is a prime.

It is a super-2 number, since 2×78268275² = 12251845742951250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78268275.

It is not an unprimeable number, because it can be changed into a prime (78268271) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 17301 + ... + 21350.

Almost surely, 2^78268275 is an apocalyptic number.

78268275 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78268275 is a deficient number, since it is larger than the sum of its proper divisors (66715377).

78268275 is a wasteful number, since it uses less digits than its factorization.

78268275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38673 (or 38659 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 78268275 is about 8846.9359102460. The cubic root of 78268275 is about 427.7551570030.

The spelling of 78268275 in words is "seventy-eight million, two hundred sixty-eight thousand, two hundred seventy-five".