72387913 has 8 divisors (see below), whose sum is σ = 78647688. Its totient is φ = 66226944.

The previous prime is 72387911. The next prime is 72387941. The reversal of 72387913 is 31978327.

It can be written as a sum of positive squares in 4 ways, for example, as 1849 + 72386064 = 43^2 + 8508^2 .

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 72387913 - 2¹ = 72387911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72387911) 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, 23170 + ... + 26107.

It is an arithmetic number, because the mean of its divisors is an integer number (9830961).

Almost surely, 2^72387913 is an apocalyptic number.

It is an amenable number.

72387913 is a deficient number, since it is larger than the sum of its proper divisors (6259775).

72387913 is a wasteful number, since it uses less digits than its factorization.

72387913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49403.

The product of its digits is 63504, while the sum is 40.

The square root of 72387913 is about 8508.1086617415. The cubic root of 72387913 is about 416.7625486720.

It can be divided in two parts, 7238 and 7913, that added together give a palindrome (15151).

The spelling of 72387913 in words is "seventy-two million, three hundred eighty-seven thousand, nine hundred thirteen".