28358140 has 12 divisors (see below), whose sum is σ = 59552136. Its totient is φ = 11343248.

The previous prime is 28358137. The next prime is 28358147. The reversal of 28358140 is 4185382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28358147) 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, 708934 + ... + 708973.

It is an arithmetic number, because the mean of its divisors is an integer number (4962678).

Almost surely, 2^28358140 is an apocalyptic number.

28358140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28358140 is an abundant number, since it is smaller than the sum of its proper divisors (31193996).

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

28358140 is a wasteful number, since it uses less digits than its factorization.

28358140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417916 (or 1417914 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28358140 is about 5325.2361449986. The cubic root of 28358140 is about 304.9480875546.

The spelling of 28358140 in words is "twenty-eight million, three hundred fifty-eight thousand, one hundred forty".