72087228 has 36 divisors (see below), whose sum is σ = 183999088. Its totient is φ = 23794560.

The previous prime is 72087227. The next prime is 72087229. The reversal of 72087228 is 82278027.

It is an interprime number because it is at equal distance from previous prime (72087227) and next prime (72087229).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 72087192 and 72087201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72087227) 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, 6013 + ... + 13428.

Almost surely, 2^72087228 is an apocalyptic number.

It is an amenable number.

72087228 is an abundant number, since it is smaller than the sum of its proper divisors (111911860).

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

72087228 is a wasteful number, since it uses less digits than its factorization.

72087228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19554 (or 19549 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 72087228 is about 8490.4197776082. The cubic root of 72087228 is about 416.1846982482.

The spelling of 72087228 in words is "seventy-two million, eighty-seven thousand, two hundred twenty-eight".