28258840 has 32 divisors (see below), whose sum is σ = 65136960. Its totient is φ = 11027200.

The previous prime is 28258831. The next prime is 28258843. The reversal of 28258840 is 4885282.

It is a self number, because there is not a number n which added to its sum of digits gives 28258840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28258843) 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, 6976 + ... + 10255.

It is an arithmetic number, because the mean of its divisors is an integer number (2035530).

Almost surely, 2^28258840 is an apocalyptic number.

28258840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28258840 is an abundant number, since it is smaller than the sum of its proper divisors (36878120).

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

28258840 is a wasteful number, since it uses less digits than its factorization.

28258840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17283 (or 17279 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 37.

The square root of 28258840 is about 5315.9044385692. The cubic root of 28258840 is about 304.5917318039.

The spelling of 28258840 in words is "twenty-eight million, two hundred fifty-eight thousand, eight hundred forty".