28211625 has 64 divisors (see below), whose sum is σ = 56259840. Its totient is φ = 13867200.

The previous prime is 28211621. The next prime is 28211627. The reversal of 28211625 is 52611282.

It is a happy number.

28211625 is a `hidden beast` number, since 28 + 2 + 11 + 625 = 666.

It is not a de Polignac number, because 28211625 - 2² = 28211621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28211621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43554 + ... + 44196.

It is an arithmetic number, because the mean of its divisors is an integer number (879060).

Almost surely, 2^28211625 is an apocalyptic number.

28211625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28211625 is a deficient number, since it is larger than the sum of its proper divisors (28048215).

28211625 is a wasteful number, since it uses less digits than its factorization.

28211625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 664 counting only the distinct ones).

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

The square root of 28211625 is about 5311.4616632336. The cubic root of 28211625 is about 304.4219994829.

The spelling of 28211625 in words is "twenty-eight million, two hundred eleven thousand, six hundred twenty-five".