72302506 has 4 divisors (see below), whose sum is σ = 108453762. Its totient is φ = 36151252.

The previous prime is 72302453. The next prime is 72302521. The reversal of 72302506 is 60520327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60520327 = 7 ⋅8645761.

It can be written as a sum of positive squares in only one way, i.e., 65464281 + 6838225 = 8091^2 + 2615^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18075625 + ... + 18075628.

Almost surely, 2^72302506 is an apocalyptic number.

72302506 is a deficient number, since it is larger than the sum of its proper divisors (36151256).

72302506 is a wasteful number, since it uses less digits than its factorization.

72302506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36151255.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 72302506 is about 8503.0880272993. The cubic root of 72302506 is about 416.5985781719.

The spelling of 72302506 in words is "seventy-two million, three hundred two thousand, five hundred six".