72613649 has 4 divisors (see below), whose sum is σ = 76435440. Its totient is φ = 68791860.

The previous prime is 72613643. The next prime is 72613663. The reversal of 72613649 is 94631627.

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: 94631627 = 2011 ⋅47057.

It is a cyclic number.

It is not a de Polignac number, because 72613649 - 2⁴ = 72613633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72613643) 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, 1910867 + ... + 1910904.

It is an arithmetic number, because the mean of its divisors is an integer number (19108860).

Almost surely, 2^72613649 is an apocalyptic number.

It is an amenable number.

72613649 is a deficient number, since it is larger than the sum of its proper divisors (3821791).

72613649 is a wasteful number, since it uses less digits than its factorization.

72613649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821790.

The product of its digits is 54432, while the sum is 38.

The square root of 72613649 is about 8521.3642687072. The cubic root of 72613649 is about 417.1953128538.

The spelling of 72613649 in words is "seventy-two million, six hundred thirteen thousand, six hundred forty-nine".