28030890 has 32 divisors (see below), whose sum is σ = 70816320. Its totient is φ = 7081344.

The previous prime is 28030889. The next prime is 28030957. The reversal of 28030890 is 9803082.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 24019 + ... + 25158.

It is an arithmetic number, because the mean of its divisors is an integer number (2213010).

Almost surely, 2^28030890 is an apocalyptic number.

28030890 is an abundant number, since it is smaller than the sum of its proper divisors (42785430).

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

28030890 is a wasteful number, since it uses less digits than its factorization.

28030890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49206.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28030890 is about 5294.4206481918. The cubic root of 28030890 is about 303.7705230930.

It can be divided in two parts, 28030 and 890, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28030890 in words is "twenty-eight million, thirty thousand, eight hundred ninety".