72804530 has 16 divisors (see below), whose sum is σ = 134590680. Its totient is φ = 28334592.

The previous prime is 72804527. The next prime is 72804533. The reversal of 72804530 is 3540827.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72804527) and next prime (72804533).

It can be written as a sum of positive squares in 4 ways, for example, as 64272289 + 8532241 = 8017^2 + 2921^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72804493 and 72804502.

It is not an unprimeable number, because it can be changed into a prime (72804533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98015 + ... + 98754.

Almost surely, 2^72804530 is an apocalyptic number.

72804530 is a deficient number, since it is larger than the sum of its proper divisors (61786150).

72804530 is a wasteful number, since it uses less digits than its factorization.

72804530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196813.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 72804530 is about 8532.5570610457. The cubic root of 72804530 is about 417.5605563135.

The spelling of 72804530 in words is "seventy-two million, eight hundred four thousand, five hundred thirty".