28859840 has 28 divisors (see below), whose sum is σ = 68723256. Its totient is φ = 11543808.

The previous prime is 28859839. The next prime is 28859849. The reversal of 28859840 is 4895882.

It is a junction number, because it is equal to n+sod(n) for n = 28859791 and 28859800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28859849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44774 + ... + 45413.

It is an arithmetic number, because the mean of its divisors is an integer number (2454402).

Almost surely, 2^28859840 is an apocalyptic number.

28859840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28859840 is an abundant number, since it is smaller than the sum of its proper divisors (39863416).

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

28859840 is an equidigital number, since it uses as much as digits as its factorization.

28859840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90204 (or 90194 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 28859840 is about 5372.1355157889. The cubic root of 28859840 is about 306.7359221868.

The spelling of 28859840 in words is "twenty-eight million, eight hundred fifty-nine thousand, eight hundred forty".