72728497 has 4 divisors (see below), whose sum is σ = 72750960. Its totient is φ = 72706036.

The previous prime is 72728489. The next prime is 72728519. The reversal of 72728497 is 79482727.

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 72728497 - 2³ = 72728489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72728477) 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, 5347 + ... + 13192.

It is an arithmetic number, because the mean of its divisors is an integer number (18187740).

Almost surely, 2^72728497 is an apocalyptic number.

It is an amenable number.

72728497 is a deficient number, since it is larger than the sum of its proper divisors (22463).

72728497 is a wasteful number, since it uses less digits than its factorization.

72728497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22462.

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

The square root of 72728497 is about 8528.1004332735. The cubic root of 72728497 is about 417.4151466791.

The spelling of 72728497 in words is "seventy-two million, seven hundred twenty-eight thousand, four hundred ninety-seven".