72849721 has 24 divisors (see below), whose sum is σ = 88281600. Its totient is φ = 59875200.

The previous prime is 72849713. The next prime is 72849731. The reversal of 72849721 is 12794827.

It is not a de Polignac number, because 72849721 - 2³ = 72849713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72849731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302161 + ... + 302401.

It is an arithmetic number, because the mean of its divisors is an integer number (3678400).

Almost surely, 2^72849721 is an apocalyptic number.

It is an amenable number.

72849721 is a deficient number, since it is larger than the sum of its proper divisors (15431879).

72849721 is a wasteful number, since it uses less digits than its factorization.

72849721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 478 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 72849721 is about 8535.2048012921. The cubic root of 72849721 is about 417.6469340712.

The spelling of 72849721 in words is "seventy-two million, eight hundred forty-nine thousand, seven hundred twenty-one".