72440365 has 4 divisors (see below), whose sum is σ = 86928444. Its totient is φ = 57952288.

The previous prime is 72440353. The next prime is 72440387. The reversal of 72440365 is 56304427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56304427 = 151 ⋅372877.

It can be written as a sum of positive squares in 2 ways, for example, as 51883209 + 20557156 = 7203^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 72440365 - 2¹⁵ = 72407597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7244032 + ... + 7244041.

It is an arithmetic number, because the mean of its divisors is an integer number (21732111).

Almost surely, 2^72440365 is an apocalyptic number.

It is an amenable number.

72440365 is a deficient number, since it is larger than the sum of its proper divisors (14488079).

72440365 is a wasteful number, since it uses less digits than its factorization.

72440365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14488078.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 72440365 is about 8511.1905747668. The cubic root of 72440365 is about 416.8631858757.

The spelling of 72440365 in words is "seventy-two million, four hundred forty thousand, three hundred sixty-five".