72949913 has 4 divisors (see below), whose sum is σ = 75303168. Its totient is φ = 70596660.

The previous prime is 72949909. The next prime is 72949927. The reversal of 72949913 is 31994927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31994927 = 61 ⋅524507.

It is a cyclic number.

It is not a de Polignac number, because 72949913 - 2² = 72949909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72949213) 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, 1176581 + ... + 1176642.

It is an arithmetic number, because the mean of its divisors is an integer number (18825792).

Almost surely, 2^72949913 is an apocalyptic number.

It is an amenable number.

72949913 is a deficient number, since it is larger than the sum of its proper divisors (2353255).

72949913 is a wasteful number, since it uses less digits than its factorization.

72949913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353254.

The product of its digits is 122472, while the sum is 44.

The square root of 72949913 is about 8541.0721223977. The cubic root of 72949913 is about 417.8383130372.

The spelling of 72949913 in words is "seventy-two million, nine hundred forty-nine thousand, nine hundred thirteen".