72805570 has 16 divisors (see below), whose sum is σ = 133523640. Its totient is φ = 28572544.

The previous prime is 72805567. The next prime is 72805589. The reversal of 72805570 is 7550827.

It can be written as a sum of positive squares in 4 ways, for example, as 56957209 + 15848361 = 7547^2 + 3981^2 .

It is an unprimeable number.

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, 68155 + ... + 69214.

Almost surely, 2^72805570 is an apocalyptic number.

72805570 is a deficient number, since it is larger than the sum of its proper divisors (60718070).

72805570 is a wasteful number, since it uses less digits than its factorization.

72805570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137429.

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 72805570 is about 8532.6180038720. The cubic root of 72805570 is about 417.5625445639.

The spelling of 72805570 in words is "seventy-two million, eight hundred five thousand, five hundred seventy".