28131782 has 12 divisors (see below), whose sum is σ = 49087260. Its totient is φ = 12056436.

The previous prime is 28131767. The next prime is 28131811. The reversal of 28131782 is 28713182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143432 + ... + 143627.

It is an arithmetic number, because the mean of its divisors is an integer number (4090605).

Almost surely, 2^28131782 is an apocalyptic number.

28131782 is a deficient number, since it is larger than the sum of its proper divisors (20955478).

28131782 is a wasteful number, since it uses less digits than its factorization.

28131782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287075 (or 287068 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 28131782 is about 5303.9402334491. The cubic root of 28131782 is about 304.1345419587.

The spelling of 28131782 in words is "twenty-eight million, one hundred thirty-one thousand, seven hundred eighty-two".