72798581 has 2 divisors, whose sum is σ = 72798582. Its totient is φ = 72798580.

The previous prime is 72798577. The next prime is 72798599. The reversal of 72798581 is 18589727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 7107556 = 8105^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 72798581 - 2² = 72798577 is a prime.

It is a super-2 number, since 2×72798581² = 10599266791227122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72798511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36399290 + 36399291.

It is an arithmetic number, because the mean of its divisors is an integer number (36399291).

Almost surely, 2^72798581 is an apocalyptic number.

It is an amenable number.

72798581 is a deficient number, since it is larger than the sum of its proper divisors (1).

72798581 is an equidigital number, since it uses as much as digits as its factorization.

72798581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 47.

The square root of 72798581 is about 8532.2084479928. The cubic root of 72798581 is about 417.5491827749.

The spelling of 72798581 in words is "seventy-two million, seven hundred ninety-eight thousand, five hundred eighty-one".