72225420 has 24 divisors (see below), whose sum is σ = 202231344. Its totient is φ = 19260096.

The previous prime is 72225407. The next prime is 72225421. The reversal of 72225420 is 2452227.

It is a super-2 number, since 2×72225420² = 10433022588352800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72225421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601819 + ... + 601938.

It is an arithmetic number, because the mean of its divisors is an integer number (8426306).

Almost surely, 2^72225420 is an apocalyptic number.

It is an amenable number.

72225420 is an abundant number, since it is smaller than the sum of its proper divisors (130005924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72225420 is a wasteful number, since it uses less digits than its factorization.

72225420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203769 (or 1203767 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 72225420 is about 8498.5539946511. The cubic root of 72225420 is about 416.4504720209.

Adding to 72225420 its reverse (2452227), we get a palindrome (74677647).

The spelling of 72225420 in words is "seventy-two million, two hundred twenty-five thousand, four hundred twenty".