28159740 has 72 divisors (see below), whose sum is σ = 97624800. Its totient is φ = 6436224.

The previous prime is 28159739. The next prime is 28159741. The reversal of 28159740 is 4795182.

28159740 is a `hidden beast` number, since 28 + 1 + 597 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (28159739) and next prime (28159741).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28159695 and 28159704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28159741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9915 + ... + 12434.

It is an arithmetic number, because the mean of its divisors is an integer number (1355900).

Almost surely, 2^28159740 is an apocalyptic number.

28159740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28159740 is an abundant number, since it is smaller than the sum of its proper divisors (69465060).

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

28159740 is a wasteful number, since it uses less digits than its factorization.

28159740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22371 (or 22366 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28159740 is about 5306.5751667153. The cubic root of 28159740 is about 304.2352605250.

The spelling of 28159740 in words is "twenty-eight million, one hundred fifty-nine thousand, seven hundred forty".