72717770 has 8 divisors (see below), whose sum is σ = 130892004. Its totient is φ = 29087104.

The previous prime is 72717767. The next prime is 72717781. The reversal of 72717770 is 7771727.

It can be written as a sum of positive squares in 2 ways, for example, as 65626201 + 7091569 = 8101^2 + 2663^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 3635879 + ... + 3635898.

Almost surely, 2^72717770 is an apocalyptic number.

72717770 is a deficient number, since it is larger than the sum of its proper divisors (58174234).

72717770 is a wasteful number, since it uses less digits than its factorization.

72717770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7271784.

The product of its (nonzero) digits is 33614, while the sum is 38.

The square root of 72717770 is about 8527.4714892517. The cubic root of 72717770 is about 417.3946236259.

The spelling of 72717770 in words is "seventy-two million, seven hundred seventeen thousand, seven hundred seventy".