28501625 has 8 divisors (see below), whose sum is σ = 35570184. Its totient is φ = 22801200.

The previous prime is 28501621. The next prime is 28501657. The reversal of 28501625 is 52610582.

It can be written as a sum of positive squares in 4 ways, for example, as 506944 + 27994681 = 712^2 + 5291^2 .

It is not a de Polignac number, because 28501625 - 2² = 28501621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28501621) 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, 113882 + ... + 114131.

It is an arithmetic number, because the mean of its divisors is an integer number (4446273).

Almost surely, 2^28501625 is an apocalyptic number.

28501625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28501625 is a deficient number, since it is larger than the sum of its proper divisors (7068559).

28501625 is an equidigital number, since it uses as much as digits as its factorization.

28501625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228028 (or 228018 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 28501625 is about 5338.6913190407. The cubic root of 28501625 is about 305.4615425494.

The spelling of 28501625 in words is "twenty-eight million, five hundred one thousand, six hundred twenty-five".