28145724165 has 96 divisors (see below), whose sum is σ = 54137341440. Its totient is φ = 13440043008.

The previous prime is 28145724133. The next prime is 28145724179. The reversal of 28145724165 is 56142754182.

28145724165 is a `hidden beast` number, since 2 + 8 + 14 + 572 + 4 + 1 + 65 = 666.

It is not a de Polignac number, because 28145724165 - 2⁵ = 28145724133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28145724165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3102406 + ... + 3111464.

It is an arithmetic number, because the mean of its divisors is an integer number (563930640).

Almost surely, 2^28145724165 is an apocalyptic number.

It is an amenable number.

28145724165 is a deficient number, since it is larger than the sum of its proper divisors (25991617275).

28145724165 is a wasteful number, since it uses less digits than its factorization.

28145724165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9243 (or 9240 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The spelling of 28145724165 in words is "twenty-eight billion, one hundred forty-five million, seven hundred twenty-four thousand, one hundred sixty-five".