72274813 has 8 divisors (see below), whose sum is σ = 79111256. Its totient is φ = 65620800.

The previous prime is 72274777. The next prime is 72274819. The reversal of 72274813 is 31847227.

It can be written as a sum of positive squares in 4 ways, for example, as 7601049 + 64673764 = 2757^2 + 8042^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72274813 - 2²¹ = 70177661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72274819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44778 + ... + 46363.

It is an arithmetic number, because the mean of its divisors is an integer number (9888907).

Almost surely, 2^72274813 is an apocalyptic number.

It is an amenable number.

72274813 is a deficient number, since it is larger than the sum of its proper divisors (6836443).

72274813 is a wasteful number, since it uses less digits than its factorization.

72274813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91215.

The product of its digits is 18816, while the sum is 34.

The square root of 72274813 is about 8501.4594629393. The cubic root of 72274813 is about 416.5453834381.

The spelling of 72274813 in words is "seventy-two million, two hundred seventy-four thousand, eight hundred thirteen".