72426913 has 8 divisors (see below), whose sum is σ = 78283688. Its totient is φ = 66610944.

The previous prime is 72426889. The next prime is 72426929. The reversal of 72426913 is 31962427.

It can be written as a sum of positive squares in 4 ways, for example, as 4397409 + 68029504 = 2097^2 + 8248^2 .

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 72426913 - 2⁹ = 72426401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72426983) 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, 6456 + ... + 13657.

It is an arithmetic number, because the mean of its divisors is an integer number (9785461).

Almost surely, 2^72426913 is an apocalyptic number.

It is an amenable number.

72426913 is a deficient number, since it is larger than the sum of its proper divisors (5856775).

72426913 is a wasteful number, since it uses less digits than its factorization.

72426913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20403.

The product of its digits is 18144, while the sum is 34.

The square root of 72426913 is about 8510.4002843580. The cubic root of 72426913 is about 416.8373807843.

The spelling of 72426913 in words is "seventy-two million, four hundred twenty-six thousand, nine hundred thirteen".