28145421577 has 32 divisors (see below), whose sum is σ = 35585948160. Its totient is φ = 21664212480.

The previous prime is 28145421539. The next prime is 28145421581. The reversal of 28145421577 is 77512454182.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28145421577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28145421587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1328923 + ... + 1349935.

It is an arithmetic number, because the mean of its divisors is an integer number (1112060880).

Almost surely, 2^28145421577 is an apocalyptic number.

It is an amenable number.

28145421577 is a deficient number, since it is larger than the sum of its proper divisors (7440526583).

28145421577 is a wasteful number, since it uses less digits than its factorization.

28145421577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21433.

The product of its digits is 627200, while the sum is 46.

It can be divided in two parts, 281454 and 21577, that added together give a triangular number (303031 = T₇₇₈).

The spelling of 28145421577 in words is "twenty-eight billion, one hundred forty-five million, four hundred twenty-one thousand, five hundred seventy-seven".