72828545 has 4 divisors (see below), whose sum is σ = 87394260. Its totient is φ = 58262832.

The previous prime is 72828529. The next prime is 72828583. The reversal of 72828545 is 54582827.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28858384 + 43970161 = 5372^2 + 6631^2 .

It is a cyclic number.

It is not a de Polignac number, because 72828545 - 2⁴ = 72828529 is a prime.

It is a super-3 number, since 3×72828545³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7282850 + ... + 7282859.

It is an arithmetic number, because the mean of its divisors is an integer number (21848565).

Almost surely, 2^72828545 is an apocalyptic number.

It is an amenable number.

72828545 is a deficient number, since it is larger than the sum of its proper divisors (14565715).

72828545 is a wasteful number, since it uses less digits than its factorization.

72828545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14565714.

The product of its digits is 179200, while the sum is 41.

The square root of 72828545 is about 8533.9642019404. The cubic root of 72828545 is about 417.6064628636.

The spelling of 72828545 in words is "seventy-two million, eight hundred twenty-eight thousand, five hundred forty-five".