28102840 has 32 divisors (see below), whose sum is σ = 63892080. Its totient is φ = 11123712.

The previous prime is 28102831. The next prime is 28102859. The reversal of 28102840 is 4820182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259 + ... + 7501.

Almost surely, 2^28102840 is an apocalyptic number.

28102840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28102840 is an abundant number, since it is smaller than the sum of its proper divisors (35789240).

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

28102840 is a wasteful number, since it uses less digits than its factorization.

28102840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7351 (or 7347 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28102840 is about 5301.2111823620. The cubic root of 28102840 is about 304.0302082170.

The spelling of 28102840 in words is "twenty-eight million, one hundred two thousand, eight hundred forty".