28950121 has 4 divisors (see below), whose sum is σ = 29346772. Its totient is φ = 28553472.

The previous prime is 28950113. The next prime is 28950127. The reversal of 28950121 is 12105982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9272025 + 19678096 = 3045^2 + 4436^2 .

It is a cyclic number.

It is not a de Polignac number, because 28950121 - 2³ = 28950113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28950121.

It is not an unprimeable number, because it can be changed into a prime (28950127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198216 + ... + 198361.

It is an arithmetic number, because the mean of its divisors is an integer number (7336693).

Almost surely, 2^28950121 is an apocalyptic number.

It is an amenable number.

28950121 is a deficient number, since it is larger than the sum of its proper divisors (396651).

28950121 is an equidigital number, since it uses as much as digits as its factorization.

28950121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396650.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 28950121 is about 5380.5316651796. The cubic root of 28950121 is about 307.0554388523.

The spelling of 28950121 in words is "twenty-eight million, nine hundred fifty thousand, one hundred twenty-one".