28194690 has 16 divisors (see below), whose sum is σ = 67667328. Its totient is φ = 7518576.

The previous prime is 28194671. The next prime is 28194701. The reversal of 28194690 is 9649182.

It is a super-2 number, since 2×28194690² = 1589881088392200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469882 + ... + 469941.

It is an arithmetic number, because the mean of its divisors is an integer number (4229208).

Almost surely, 2^28194690 is an apocalyptic number.

28194690 is an abundant number, since it is smaller than the sum of its proper divisors (39472638).

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

28194690 is a wasteful number, since it uses less digits than its factorization.

28194690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939833.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 28194690 is about 5309.8672299785. The cubic root of 28194690 is about 304.3610740255.

The spelling of 28194690 in words is "twenty-eight million, one hundred ninety-four thousand, six hundred ninety".