72445428 has 60 divisors (see below), whose sum is σ = 206613792. Its totient is φ = 21952080.

The previous prime is 72445427. The next prime is 72445447. The reversal of 72445428 is 82454427.

72445428 is a `hidden beast` number, since 72 + 44 + 542 + 8 = 666.

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 = 72445392 and 72445401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72445427) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6600 + ... + 13727.

Almost surely, 2^72445428 is an apocalyptic number.

It is an amenable number.

72445428 is an abundant number, since it is smaller than the sum of its proper divisors (134168364).

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

72445428 is a wasteful number, since it uses less digits than its factorization.

72445428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20354 (or 20343 counting only the distinct ones).

The product of its digits is 71680, while the sum is 36.

The square root of 72445428 is about 8511.4880015189. The cubic root of 72445428 is about 416.8728974462.

The spelling of 72445428 in words is "seventy-two million, four hundred forty-five thousand, four hundred twenty-eight".