78268172 has 24 divisors (see below), whose sum is σ = 146793696. Its totient is φ = 36419328.

The previous prime is 78268159. The next prime is 78268181. The reversal of 78268172 is 27186287.

It is a super-2 number, since 2×78268172² = 12251813496443168, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 8093 + ... + 14900.

It is an arithmetic number, because the mean of its divisors is an integer number (6116404).

Almost surely, 2^78268172 is an apocalyptic number.

It is an amenable number.

78268172 is a deficient number, since it is larger than the sum of its proper divisors (68525524).

78268172 is a wasteful number, since it uses less digits than its factorization.

78268172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23057 (or 23055 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 78268172 is about 8846.9300890196. The cubic root of 78268172 is about 427.7549693629.

The spelling of 78268172 in words is "seventy-eight million, two hundred sixty-eight thousand, one hundred seventy-two".