28426140 has 72 divisors (see below), whose sum is σ = 89434800. Its totient is φ = 7579008.

The previous prime is 28426129. The next prime is 28426171. The reversal of 28426140 is 4162482.

28426140 is a `hidden beast` number, since 2 + 8 + 42 + 614 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1936 + ... + 7784.

It is an arithmetic number, because the mean of its divisors is an integer number (1242150).

Almost surely, 2^28426140 is an apocalyptic number.

28426140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28426140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44717400).

28426140 is an abundant number, since it is smaller than the sum of its proper divisors (61008660).

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

28426140 is a wasteful number, since it uses less digits than its factorization.

28426140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5873 (or 5859 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28426140 is about 5331.6170155029. The cubic root of 28426140 is about 305.1916380523.

The spelling of 28426140 in words is "twenty-eight million, four hundred twenty-six thousand, one hundred forty".