28135590 has 32 divisors (see below), whose sum is σ = 77172480. Its totient is φ = 6430944.

The previous prime is 28135573. The next prime is 28135607. The reversal of 28135590 is 9553182.

It is an interprime number because it is at equal distance from previous prime (28135573) and next prime (28135607).

It is a super-2 number, since 2×28135590² = 1583222849296200, which contains 22 as substring.

It is a congruent number.

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, 66780 + ... + 67199.

It is an arithmetic number, because the mean of its divisors is an integer number (2411640).

Almost surely, 2^28135590 is an apocalyptic number.

28135590 is an abundant number, since it is smaller than the sum of its proper divisors (49036890).

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

28135590 is a wasteful number, since it uses less digits than its factorization.

28135590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133996.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 28135590 is about 5304.2991997058. The cubic root of 28135590 is about 304.1482641855.

The spelling of 28135590 in words is "twenty-eight million, one hundred thirty-five thousand, five hundred ninety".