28088646 has 32 divisors (see below), whose sum is σ = 58687200. Its totient is φ = 8951040.

The previous prime is 28088639. The next prime is 28088647. The reversal of 28088646 is 64688082.

It is a super-2 number, since 2×28088646² = 1577944068226632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28088598 and 28088607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28088647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18226 + ... + 19706.

It is an arithmetic number, because the mean of its divisors is an integer number (1833975).

Almost surely, 2^28088646 is an apocalyptic number.

28088646 is an abundant number, since it is smaller than the sum of its proper divisors (30598554).

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

28088646 is a wasteful number, since it uses less digits than its factorization.

28088646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624.

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 28088646 is about 5299.8722626116. The cubic root of 28088646 is about 303.9790137290.

The spelling of 28088646 in words is "twenty-eight million, eighty-eight thousand, six hundred forty-six".