28625121 has 24 divisors (see below), whose sum is σ = 48781824. Its totient is φ = 15828480.

The previous prime is 28625119. The next prime is 28625131. The reversal of 28625121 is 12152682.

It is a happy number.

28625121 is a `hidden beast` number, since 28 + 625 + 12 + 1 = 666.

It is not a de Polignac number, because 28625121 - 2¹ = 28625119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28625111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5376 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (2032576).

Almost surely, 2^28625121 is an apocalyptic number.

28625121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28625121 is a deficient number, since it is larger than the sum of its proper divisors (20156703).

28625121 is a wasteful number, since it uses less digits than its factorization.

28625121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14701 (or 14698 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 28625121 is about 5350.2449476636. The cubic root of 28625121 is about 305.9020896542.

The spelling of 28625121 in words is "twenty-eight million, six hundred twenty-five thousand, one hundred twenty-one".