28140730 has 32 divisors (see below), whose sum is σ = 54691200. Its totient is φ = 10393152.

The previous prime is 28140713. The next prime is 28140731. The reversal of 28140730 is 3704182.

It is a junction number, because it is equal to n+sod(n) for n = 28140695 and 28140704.

It is not an unprimeable number, because it can be changed into a prime (28140731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4561 + ... + 8779.

It is an arithmetic number, because the mean of its divisors is an integer number (1709100).

Almost surely, 2^28140730 is an apocalyptic number.

28140730 is a deficient number, since it is larger than the sum of its proper divisors (26550470).

28140730 is a wasteful number, since it uses less digits than its factorization.

28140730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 28140730 is about 5304.7836902177. The cubic root of 28140730 is about 304.1667843456.

The spelling of 28140730 in words is "twenty-eight million, one hundred forty thousand, seven hundred thirty".