72820545 has 16 divisors (see below), whose sum is σ = 133157760. Its totient is φ = 33289344.

The previous prime is 72820529. The next prime is 72820547. The reversal of 72820545 is 54502827.

It is not a de Polignac number, because 72820545 - 2⁴ = 72820529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72820547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346660 + ... + 346869.

It is an arithmetic number, because the mean of its divisors is an integer number (8322360).

Almost surely, 2^72820545 is an apocalyptic number.

It is an amenable number.

72820545 is a deficient number, since it is larger than the sum of its proper divisors (60337215).

72820545 is a wasteful number, since it uses less digits than its factorization.

72820545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693544.

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 72820545 is about 8533.4954737200. The cubic root of 72820545 is about 417.5911713592.

The spelling of 72820545 in words is "seventy-two million, eight hundred twenty thousand, five hundred forty-five".