72220423 has 6 divisors (see below), whose sum is σ = 79382912. Its totient is φ = 65654820.

The previous prime is 72220381. The next prime is 72220429. The reversal of 72220423 is 32402227.

It is not a de Polignac number, because 72220423 - 2⁹ = 72219911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72220394 and 72220403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72220429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 298311 + ... + 298552.

Almost surely, 2^72220423 is an apocalyptic number.

72220423 is a deficient number, since it is larger than the sum of its proper divisors (7162489).

72220423 is a wasteful number, since it uses less digits than its factorization.

72220423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596885 (or 596874 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 72220423 is about 8498.2599983761. The cubic root of 72220423 is about 416.4408675954.

It can be divided in two parts, 722204 and 23, that added together give a palindrome (722227).

The spelling of 72220423 in words is "seventy-two million, two hundred twenty thousand, four hundred twenty-three".