28421625 has 32 divisors (see below), whose sum is σ = 49795200. Its totient is φ = 14356800.

The previous prime is 28421623. The next prime is 28421633. The reversal of 28421625 is 52612482.

It is not a de Polignac number, because 28421625 - 2¹ = 28421623 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28421592 and 28421601.

It is not an unprimeable number, because it can be changed into a prime (28421623) 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, 5131 + ... + 9119.

It is an arithmetic number, because the mean of its divisors is an integer number (1556100).

Almost surely, 2^28421625 is an apocalyptic number.

28421625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28421625 is the 2850-th nonagonal number.

It is an amenable number.

28421625 is a deficient number, since it is larger than the sum of its proper divisors (21373575).

28421625 is a wasteful number, since it uses less digits than its factorization.

28421625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026 (or 4016 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 28421625 is about 5331.1935811786. The cubic root of 28421625 is about 305.1754790615.

The spelling of 28421625 in words is "twenty-eight million, four hundred twenty-one thousand, six hundred twenty-five".