72273917 has 4 divisors (see below), whose sum is σ = 72322656. Its totient is φ = 72225180.

The previous prime is 72273907. The next prime is 72273923. The reversal of 72273917 is 71937227.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71937227 = 5393 ⋅13339.

It is a cyclic number.

It is not a de Polignac number, because 72273917 - 2¹⁸ = 72011773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72273907) 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, 22073 + ... + 25134.

It is an arithmetic number, because the mean of its divisors is an integer number (18080664).

Almost surely, 2^72273917 is an apocalyptic number.

It is an amenable number.

72273917 is a deficient number, since it is larger than the sum of its proper divisors (48739).

72273917 is a wasteful number, since it uses less digits than its factorization.

72273917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48738.

The product of its digits is 37044, while the sum is 38.

The square root of 72273917 is about 8501.4067659417. The cubic root of 72273917 is about 416.5436621091.

The spelling of 72273917 in words is "seventy-two million, two hundred seventy-three thousand, nine hundred seventeen".