28619890 has 32 divisors (see below), whose sum is σ = 58403520. Its totient is φ = 10010304.

The previous prime is 28619861. The next prime is 28619911. The reversal of 28619890 is 9891682.

It is a happy number.

It is a super-2 number, since 2×28619890² = 1638196207224200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 15 ways as a sum of consecutive naturals, for example, 3324 + ... + 8263.

It is an arithmetic number, because the mean of its divisors is an integer number (1825110).

Almost surely, 2^28619890 is an apocalyptic number.

28619890 is an abundant number, since it is smaller than the sum of its proper divisors (29783630).

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

28619890 is a wasteful number, since it uses less digits than its factorization.

28619890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11626.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 28619890 is about 5349.7560692054. The cubic root of 28619890 is about 305.8834548414.

The spelling of 28619890 in words is "twenty-eight million, six hundred nineteen thousand, eight hundred ninety".