72028530 has 72 divisors (see below), whose sum is σ = 217862892. Its totient is φ = 16462656.

The previous prime is 72028511. The next prime is 72028543. The reversal of 72028530 is 3582027.

It can be written as a sum of positive squares in 2 ways, for example, as 64689849 + 7338681 = 8043^2 + 2709^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72028494 and 72028503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3757 + ... + 12576.

Almost surely, 2^72028530 is an apocalyptic number.

72028530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

72028530 is an abundant number, since it is smaller than the sum of its proper divisors (145834362).

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

72028530 is a wasteful number, since it uses less digits than its factorization.

72028530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16360 (or 16350 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 72028530 is about 8486.9623541053. The cubic root of 72028530 is about 416.0717062351.

The spelling of 72028530 in words is "seventy-two million, twenty-eight thousand, five hundred thirty".