72172069 has 4 divisors (see below), whose sum is σ = 73041696. Its totient is φ = 71302444.

The previous prime is 72172063. The next prime is 72172099. The reversal of 72172069 is 96027127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72172069 is a prime.

It is a super-2 number, since 2×72172069² = 10417615087481522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72172063) 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, 434689 + ... + 434854.

It is an arithmetic number, because the mean of its divisors is an integer number (18260424).

Almost surely, 2^72172069 is an apocalyptic number.

It is an amenable number.

72172069 is a deficient number, since it is larger than the sum of its proper divisors (869627).

72172069 is an equidigital number, since it uses as much as digits as its factorization.

72172069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869626.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 72172069 is about 8495.4145867050. The cubic root of 72172069 is about 416.3479064606.

The spelling of 72172069 in words is "seventy-two million, one hundred seventy-two thousand, sixty-nine".