28811530 has 32 divisors (see below), whose sum is σ = 58112640. Its totient is φ = 10192320.

The previous prime is 28811527. The next prime is 28811533. The reversal of 28811530 is 3511882.

It is an interprime number because it is at equal distance from previous prime (28811527) and next prime (28811533).

It is not an unprimeable number, because it can be changed into a prime (28811533) 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, 531 + ... + 7609.

It is an arithmetic number, because the mean of its divisors is an integer number (1816020).

Almost surely, 2^28811530 is an apocalyptic number.

28811530 is an abundant number, since it is smaller than the sum of its proper divisors (29301110).

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

28811530 is a wasteful number, since it uses less digits than its factorization.

28811530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28811530 is about 5367.6372828275. The cubic root of 28811530 is about 306.5646728135.

The spelling of 28811530 in words is "twenty-eight million, eight hundred eleven thousand, five hundred thirty".