28015830 has 48 divisors (see below), whose sum is σ = 77130144. Its totient is φ = 7031040.

The previous prime is 28015787. The next prime is 28015837. The reversal of 28015830 is 3851082.

It is a happy number.

28015830 is a `hidden beast` number, since 2 + 80 + 1 + 583 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28015794 and 28015803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28015837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7626 + ... + 10685.

It is an arithmetic number, because the mean of its divisors is an integer number (1606878).

Almost surely, 2^28015830 is an apocalyptic number.

28015830 is an abundant number, since it is smaller than the sum of its proper divisors (49114314).

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

28015830 is a wasteful number, since it uses less digits than its factorization.

28015830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18341 (or 18338 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28015830 is about 5292.9982051763. The cubic root of 28015830 is about 303.7161116489.

It can be divided in two parts, 280 and 15830, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 28015830 in words is "twenty-eight million, fifteen thousand, eight hundred thirty".