28088690 has 32 divisors (see below), whose sum is σ = 59197824. Its totient is φ = 9394560.

The previous prime is 28088659. The next prime is 28088729. The reversal of 28088690 is 9688082.

It is a happy number.

It is a super-2 number, since 2×28088690² = 1577949011832200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2024 + ... + 7763.

It is an arithmetic number, because the mean of its divisors is an integer number (1849932).

Almost surely, 2^28088690 is an apocalyptic number.

28088690 is an abundant number, since it is smaller than the sum of its proper divisors (31109134).

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

28088690 is a wasteful number, since it uses less digits than its factorization.

28088690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 28088690 is about 5299.8764136534. The cubic root of 28088690 is about 303.9791724535.

The spelling of 28088690 in words is "twenty-eight million, eighty-eight thousand, six hundred ninety".