72168778 has 16 divisors (see below), whose sum is σ = 118552896. Its totient is φ = 32676640.

The previous prime is 72168769. The next prime is 72168781. The reversal of 72168778 is 87786127.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451 + ... + 12022.

It is an arithmetic number, because the mean of its divisors is an integer number (7409556).

Almost surely, 2^72168778 is an apocalyptic number.

72168778 is a deficient number, since it is larger than the sum of its proper divisors (46384118).

72168778 is a wasteful number, since it uses less digits than its factorization.

72168778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12749.

The product of its digits is 263424, while the sum is 46.

The square root of 72168778 is about 8495.2208917720. The cubic root of 72168778 is about 416.3415779653.

The spelling of 72168778 in words is "seventy-two million, one hundred sixty-eight thousand, seven hundred seventy-eight".