28630890 has 48 divisors (see below), whose sum is σ = 78823368. Its totient is φ = 7185408.

The previous prime is 28630867. The next prime is 28630939. The reversal of 28630890 is 9803682.

It can be written as a sum of positive squares in 4 ways, for example, as 27910089 + 720801 = 5283^2 + 849^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7827 + ... + 10886.

Almost surely, 2^28630890 is an apocalyptic number.

28630890 is an abundant number, since it is smaller than the sum of its proper divisors (50192478).

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

28630890 is a wasteful number, since it uses less digits than its factorization.

28630890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18743 (or 18740 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28630890 is about 5350.7840546970. The cubic root of 28630890 is about 305.9226383955.

The spelling of 28630890 in words is "twenty-eight million, six hundred thirty thousand, eight hundred ninety".