72820459 has 4 divisors (see below), whose sum is σ = 73190304. Its totient is φ = 72450616.

The previous prime is 72820453. The next prime is 72820471. The reversal of 72820459 is 95402827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72820459 - 2⁹ = 72819947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72820453) 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, 184627 + ... + 185020.

It is an arithmetic number, because the mean of its divisors is an integer number (18297576).

Almost surely, 2^72820459 is an apocalyptic number.

72820459 is a deficient number, since it is larger than the sum of its proper divisors (369845).

72820459 is a wasteful number, since it uses less digits than its factorization.

72820459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369844.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 72820459 is about 8533.4904347518. The cubic root of 72820459 is about 417.5910069694.

The spelling of 72820459 in words is "seventy-two million, eight hundred twenty thousand, four hundred fifty-nine".