28250890 has 16 divisors (see below), whose sum is σ = 50923080. Its totient is φ = 11284480.

The previous prime is 28250881. The next prime is 28250899. The reversal of 28250890 is 9805282.

It is an interprime number because it is at equal distance from previous prime (28250881) and next prime (28250899).

It can be written as a sum of positive squares in 4 ways, for example, as 22534009 + 5716881 = 4747^2 + 2391^2 .

It is a super-2 number, since 2×28250890² = 1596225571584200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28250899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7770 + ... + 10810.

Almost surely, 2^28250890 is an apocalyptic number.

28250890 is a deficient number, since it is larger than the sum of its proper divisors (22672190).

28250890 is a wasteful number, since it uses less digits than its factorization.

28250890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28250890 is about 5315.1566298652. The cubic root of 28250890 is about 304.5631657413.

The spelling of 28250890 in words is "twenty-eight million, two hundred fifty thousand, eight hundred ninety".