72243136 has 84 divisors (see below), whose sum is σ = 169690288. Its totient is φ = 29887488.

The previous prime is 72243131. The next prime is 72243137. The reversal of 72243136 is 63134227.

It is a super-2 number, since 2×72243136² = 10438141398228992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72243131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 989596 + ... + 989668.

Almost surely, 2^72243136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72243136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84845144).

72243136 is an abundant number, since it is smaller than the sum of its proper divisors (97447152).

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

72243136 is an equidigital number, since it uses as much as digits as its factorization.

72243136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 129 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 72243136 is about 8499.5962257039. The cubic root of 72243136 is about 416.4845192830.

The spelling of 72243136 in words is "seventy-two million, two hundred forty-three thousand, one hundred thirty-six".