28119890 has 8 divisors (see below), whose sum is σ = 50615820. Its totient is φ = 11247952.

The previous prime is 28119863. The next prime is 28119899. The reversal of 28119890 is 9891182.

It can be written as a sum of positive squares in 2 ways, for example, as 25775929 + 2343961 = 5077^2 + 1531^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28119890² = 1581456427224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28119899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405985 + ... + 1406004.

Almost surely, 2^28119890 is an apocalyptic number.

28119890 is a deficient number, since it is larger than the sum of its proper divisors (22495930).

28119890 is a wasteful number, since it uses less digits than its factorization.

28119890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811996.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 28119890 is about 5302.8190615936. The cubic root of 28119890 is about 304.0916808544.

The spelling of 28119890 in words is "twenty-eight million, one hundred nineteen thousand, eight hundred ninety".