72220737 has 4 divisors (see below), whose sum is σ = 96294320. Its totient is φ = 48147156.

The previous prime is 72220727. The next prime is 72220787. The reversal of 72220737 is 73702227.

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: 73702227 = 3 ⋅24567409.

It is not a de Polignac number, because 72220737 - 2¹⁶ = 72155201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72220727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12036787 + ... + 12036792.

It is an arithmetic number, because the mean of its divisors is an integer number (24073580).

Almost surely, 2^72220737 is an apocalyptic number.

It is an amenable number.

72220737 is a deficient number, since it is larger than the sum of its proper divisors (24073583).

72220737 is a wasteful number, since it uses less digits than its factorization.

72220737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24073582.

The product of its (nonzero) digits is 8232, while the sum is 30.

The square root of 72220737 is about 8498.2784727261. The cubic root of 72220737 is about 416.4414711284.

The spelling of 72220737 in words is "seventy-two million, two hundred twenty thousand, seven hundred thirty-seven".