28861830 has 24 divisors (see below), whose sum is σ = 75040992. Its totient is φ = 7696464.

The previous prime is 28861829. The next prime is 28861831. The reversal of 28861830 is 3816882.

28861830 is a `hidden beast` number, since 2 + 8 + 8 + 618 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (28861829) and next prime (28861831).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160254 + ... + 160433.

It is an arithmetic number, because the mean of its divisors is an integer number (3126708).

Almost surely, 2^28861830 is an apocalyptic number.

28861830 is an abundant number, since it is smaller than the sum of its proper divisors (46179162).

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

28861830 is a wasteful number, since it uses less digits than its factorization.

28861830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320700 (or 320697 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28861830 is about 5372.3207275813. The cubic root of 28861830 is about 306.7429722427.

The spelling of 28861830 in words is "twenty-eight million, eight hundred sixty-one thousand, eight hundred thirty".