72724789 has 4 divisors (see below), whose sum is σ = 72759456. Its totient is φ = 72690124.

The previous prime is 72724783. The next prime is 72724801. The reversal of 72724789 is 98742727.

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 a cyclic number.

It is not a de Polignac number, because 72724789 - 2¹³ = 72716597 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 (72724783) 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, 13969 + ... + 18454.

It is an arithmetic number, because the mean of its divisors is an integer number (18189864).

Almost surely, 2^72724789 is an apocalyptic number.

It is an amenable number.

72724789 is a deficient number, since it is larger than the sum of its proper divisors (34667).

72724789 is a wasteful number, since it uses less digits than its factorization.

72724789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34666.

The product of its digits is 395136, while the sum is 46.

The square root of 72724789 is about 8527.8830315618. The cubic root of 72724789 is about 417.4080527075.

The spelling of 72724789 in words is "seventy-two million, seven hundred twenty-four thousand, seven hundred eighty-nine".