28185630 has 32 divisors (see below), whose sum is σ = 73795968. Its totient is φ = 6832800.

The previous prime is 28185623. The next prime is 28185631. The reversal of 28185630 is 3658182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 28185591 and 28185600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28185631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42376 + ... + 43035.

It is an arithmetic number, because the mean of its divisors is an integer number (2306124).

Almost surely, 2^28185630 is an apocalyptic number.

28185630 is an abundant number, since it is smaller than the sum of its proper divisors (45610338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28185630 is a wasteful number, since it uses less digits than its factorization.

28185630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85432.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28185630 is about 5309.0140327560. The cubic root of 28185630 is about 304.3284696977.

It can be divided in two parts, 2818 and 5630, that added together give a palindrome (8448).

The spelling of 28185630 in words is "twenty-eight million, one hundred eighty-five thousand, six hundred thirty".