72259421 has 4 divisors (see below), whose sum is σ = 77817852. Its totient is φ = 66700992.

The previous prime is 72259391. The next prime is 72259457. The reversal of 72259421 is 12495227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7778521 + 64480900 = 2789^2 + 8030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72259421 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 (72259921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2779196 + ... + 2779221.

It is an arithmetic number, because the mean of its divisors is an integer number (19454463).

Almost surely, 2^72259421 is an apocalyptic number.

It is an amenable number.

72259421 is a deficient number, since it is larger than the sum of its proper divisors (5558431).

72259421 is a wasteful number, since it uses less digits than its factorization.

72259421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5558430.

The product of its digits is 10080, while the sum is 32.

The square root of 72259421 is about 8500.5541584064. The cubic root of 72259421 is about 416.5158114869.

The spelling of 72259421 in words is "seventy-two million, two hundred fifty-nine thousand, four hundred twenty-one".