72653709 has 4 divisors (see below), whose sum is σ = 96871616. Its totient is φ = 48435804.

The previous prime is 72653687. The next prime is 72653717. The reversal of 72653709 is 90735627.

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.

It is not a de Polignac number, because 72653709 - 2⁸ = 72653453 is a prime.

It is a super-2 number, since 2×72653709² = 10557122862913362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72653209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12108949 + ... + 12108954.

It is an arithmetic number, because the mean of its divisors is an integer number (24217904).

Almost surely, 2^72653709 is an apocalyptic number.

It is an amenable number.

72653709 is a deficient number, since it is larger than the sum of its proper divisors (24217907).

72653709 is a wasteful number, since it uses less digits than its factorization.

72653709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24217906.

The product of its (nonzero) digits is 79380, while the sum is 39.

The square root of 72653709 is about 8523.7145071852. The cubic root of 72653709 is about 417.2720191480.

The spelling of 72653709 in words is "seventy-two million, six hundred fifty-three thousand, seven hundred nine".