28165830 has 128 divisors (see below), whose sum is σ = 85847040. Its totient is φ = 5744640.

The previous prime is 28165799. The next prime is 28165861. The reversal of 28165830 is 3856182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28165799) and next prime (28165861).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 28165791 and 28165800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 205522 + ... + 205658.

It is an arithmetic number, because the mean of its divisors is an integer number (670680).

Almost surely, 2^28165830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28165830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42923520).

28165830 is an abundant number, since it is smaller than the sum of its proper divisors (57681210).

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

28165830 is a wasteful number, since it uses less digits than its factorization.

28165830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28165830 is about 5307.1489521211. The cubic root of 28165830 is about 304.2571908789.

It can be divided in two parts, 2816 and 5830, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 28165830 in words is "twenty-eight million, one hundred sixty-five thousand, eight hundred thirty".