28954956121 has 32 divisors (see below), whose sum is σ = 39719151360. Its totient is φ = 20426950656.

The previous prime is 28954956103. The next prime is 28954956167. The reversal of 28954956121 is 12165945982.

It is a happy number.

It is not a de Polignac number, because 28954956121 - 2⁵ = 28954956089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28954956221) 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, 463156 + ... + 521941.

It is an arithmetic number, because the mean of its divisors is an integer number (1241223480).

Almost surely, 2^28954956121 is an apocalyptic number.

It is an amenable number.

28954956121 is a deficient number, since it is larger than the sum of its proper divisors (10764195239).

28954956121 is a wasteful number, since it uses less digits than its factorization.

28954956121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985153.

The product of its digits is 1555200, while the sum is 52.

The spelling of 28954956121 in words is "twenty-eight billion, nine hundred fifty-four million, nine hundred fifty-six thousand, one hundred twenty-one".