72104437 has 4 divisors (see below), whose sum is σ = 72165676. Its totient is φ = 72043200.

The previous prime is 72104423. The next prime is 72104479. The reversal of 72104437 is 73440127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73440127 = 23 ⋅3193049.

It can be written as a sum of positive squares in 2 ways, for example, as 21893041 + 50211396 = 4679^2 + 7086^2 .

It is a cyclic number.

It is not a de Polignac number, because 72104437 - 2²³ = 63715829 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 (72104407) 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, 28818 + ... + 31219.

It is an arithmetic number, because the mean of its divisors is an integer number (18041419).

Almost surely, 2^72104437 is an apocalyptic number.

It is an amenable number.

72104437 is a deficient number, since it is larger than the sum of its proper divisors (61239).

72104437 is a wasteful number, since it uses less digits than its factorization.

72104437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61238.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 72104437 is about 8491.4331534789. The cubic root of 72104437 is about 416.2178134653.

The spelling of 72104437 in words is "seventy-two million, one hundred four thousand, four hundred thirty-seven".