28177275945 has 64 divisors (see below), whose sum is σ = 57401003520. Its totient is φ = 11480168448.

The previous prime is 28177275943. The next prime is 28177275947. The reversal of 28177275945 is 54957277182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28177275943) and next prime (28177275947).

It is not a de Polignac number, because 28177275945 - 2¹ = 28177275943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28177275943) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 316324 + ... + 395493.

It is an arithmetic number, because the mean of its divisors is an integer number (896890680).

Almost surely, 2^28177275945 is an apocalyptic number.

It is an amenable number.

28177275945 is an abundant number, since it is smaller than the sum of its proper divisors (29223727575).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28177275945 is a wasteful number, since it uses less digits than its factorization.

28177275945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711874.

The product of its digits is 9878400, while the sum is 57.

The spelling of 28177275945 in words is "twenty-eight billion, one hundred seventy-seven million, two hundred seventy-five thousand, nine hundred forty-five".