72620617 has 4 divisors (see below), whose sum is σ = 76892436. Its totient is φ = 68348800.

The previous prime is 72620609. The next prime is 72620621. The reversal of 72620617 is 71602627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71602627 = 4793 ⋅14939.

It can be written as a sum of positive squares in 2 ways, for example, as 48177481 + 24443136 = 6941^2 + 4944^2 .

It is a cyclic number.

It is not a de Polignac number, because 72620617 - 2³ = 72620609 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72621617) 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, 2135884 + ... + 2135917.

It is an arithmetic number, because the mean of its divisors is an integer number (19223109).

Almost surely, 2^72620617 is an apocalyptic number.

It is an amenable number.

72620617 is a deficient number, since it is larger than the sum of its proper divisors (4271819).

72620617 is a wasteful number, since it uses less digits than its factorization.

72620617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271818.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 72620617 is about 8521.7731136190. The cubic root of 72620617 is about 417.2086571034.

It can be divided in two parts, 72620 and 617, that added together give a palindrome (73237).

The spelling of 72620617 in words is "seventy-two million, six hundred twenty thousand, six hundred seventeen".