28219625 has 16 divisors (see below), whose sum is σ = 40250496. Its totient is φ = 19350000.

The previous prime is 28219613. The next prime is 28219661. The reversal of 28219625 is 52691282.

It is a happy number.

It is not a de Polignac number, because 28219625 - 2⁶ = 28219561 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15251 + ... + 17000.

It is an arithmetic number, because the mean of its divisors is an integer number (2515656).

Almost surely, 2^28219625 is an apocalyptic number.

28219625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28219625 is a deficient number, since it is larger than the sum of its proper divisors (12030871).

28219625 is an equidigital number, since it uses as much as digits as its factorization.

28219625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32273 (or 32263 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 28219625 is about 5312.2146982214. The cubic root of 28219625 is about 304.4507718516.

The spelling of 28219625 in words is "twenty-eight million, two hundred nineteen thousand, six hundred twenty-five".