78275172 has 12 divisors (see below), whose sum is σ = 182642096. Its totient is φ = 26091720.

The previous prime is 78275167. The next prime is 78275201. The reversal of 78275172 is 27157287.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78275172² = 12254005103259168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78275172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3261454 + ... + 3261477.

Almost surely, 2^78275172 is an apocalyptic number.

It is an amenable number.

78275172 is an abundant number, since it is smaller than the sum of its proper divisors (104366924).

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

78275172 is a wasteful number, since it uses less digits than its factorization.

78275172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6522938 (or 6522936 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 78275172 is about 8847.3256976332. The cubic root of 78275172 is about 427.7677212281.

The spelling of 78275172 in words is "seventy-eight million, two hundred seventy-five thousand, one hundred seventy-two".