28485900921 has 8 divisors (see below), whose sum is σ = 38254447840. Its totient is φ = 18853977312.

The previous prime is 28485900889. The next prime is 28485900929. The reversal of 28485900921 is 12900958482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28485900921 - 2⁵ = 28485900889 is a prime.

It is a super-2 number, since 2×28485900921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28485900929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34155340 + ... + 34156173.

It is an arithmetic number, because the mean of its divisors is an integer number (4781805980).

Almost surely, 2^28485900921 is an apocalyptic number.

It is an amenable number.

28485900921 is a deficient number, since it is larger than the sum of its proper divisors (9768546919).

28485900921 is a wasteful number, since it uses less digits than its factorization.

28485900921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68311655.

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 28485900921 in words is "twenty-eight billion, four hundred eighty-five million, nine hundred thousand, nine hundred twenty-one".