72399501 has 10 divisors (see below), whose sum is σ = 108152462. Its totient is φ = 48266280.

The previous prime is 72399499. The next prime is 72399521. The reversal of 72399501 is 10599327.

It can be written as a sum of positive squares in only one way, i.e., 71419401 + 980100 = 8451^2 + 990^2 .

It is not a de Polignac number, because 72399501 - 2¹ = 72399499 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 (72399521) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 446830 + ... + 446991.

Almost surely, 2^72399501 is an apocalyptic number.

It is an amenable number.

72399501 is a deficient number, since it is larger than the sum of its proper divisors (35752961).

72399501 is an equidigital number, since it uses as much as digits as its factorization.

72399501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893833 (or 893824 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 72399501 is about 8508.7896319042. The cubic root of 72399501 is about 416.7847862093.

It can be divided in two parts, 72399 and 501, that added together give a square (72900 = 270²).

The spelling of 72399501 in words is "seventy-two million, three hundred ninety-nine thousand, five hundred one".