72178794 has 12 divisors (see below), whose sum is σ = 156387426. Its totient is φ = 24059592.

The previous prime is 72178783. The next prime is 72178817. The reversal of 72178794 is 49787127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 69505569 + 2673225 = 8337^2 + 1635^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2004949 + ... + 2004984.

Almost surely, 2^72178794 is an apocalyptic number.

72178794 is an abundant number, since it is smaller than the sum of its proper divisors (84208632).

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

72178794 is a wasteful number, since it uses less digits than its factorization.

72178794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009941 (or 4009938 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 72178794 is about 8495.8103792399. The cubic root of 72178794 is about 416.3608378376.

The spelling of 72178794 in words is "seventy-two million, one hundred seventy-eight thousand, seven hundred ninety-four".