28158950281 has 16 divisors (see below), whose sum is σ = 35122163328. Its totient is φ = 21932726400.

The previous prime is 28158950251. The next prime is 28158950293. The reversal of 28158950281 is 18205985182.

It is a cyclic number.

It is not a de Polignac number, because 28158950281 - 2⁹ = 28158949769 is a prime.

It is a super-2 number, since 2×28158950281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28158950251) 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, 107851 + ... + 260671.

It is an arithmetic number, because the mean of its divisors is an integer number (2195135208).

Almost surely, 2^28158950281 is an apocalyptic number.

It is an amenable number.

28158950281 is a deficient number, since it is larger than the sum of its proper divisors (6963213047).

28158950281 is a wasteful number, since it uses less digits than its factorization.

28158950281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155232.

The product of its (nonzero) digits is 460800, while the sum is 49.

The spelling of 28158950281 in words is "twenty-eight billion, one hundred fifty-eight million, nine hundred fifty thousand, two hundred eighty-one".