72133697 has 4 divisors (see below), whose sum is σ = 72193620. Its totient is φ = 72073776.

The previous prime is 72133687. The next prime is 72133751. The reversal of 72133697 is 79633127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57395776 + 14737921 = 7576^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 72133697 - 2⁸ = 72133441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72133697.

It is not an unprimeable number, because it can be changed into a prime (72133627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28118 + ... + 30575.

It is an arithmetic number, because the mean of its divisors is an integer number (18048405).

Almost surely, 2^72133697 is an apocalyptic number.

It is an amenable number.

72133697 is a deficient number, since it is larger than the sum of its proper divisors (59923).

72133697 is a wasteful number, since it uses less digits than its factorization.

72133697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59922.

The product of its digits is 47628, while the sum is 38.

The square root of 72133697 is about 8493.1558916577. The cubic root of 72133697 is about 416.2741062852.

The spelling of 72133697 in words is "seventy-two million, one hundred thirty-three thousand, six hundred ninety-seven".