28611884 has 72 divisors (see below), whose sum is σ = 63891072. Its totient is φ = 11128320.

The previous prime is 28611883. The next prime is 28611887. The reversal of 28611884 is 48811682.

It is not an unprimeable number, because it can be changed into a prime (28611883) 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, 103154 + ... + 103430.

It is an arithmetic number, because the mean of its divisors is an integer number (887376).

Almost surely, 2^28611884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28611884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31945536).

28611884 is an abundant number, since it is smaller than the sum of its proper divisors (35279188).

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

28611884 is a wasteful number, since it uses less digits than its factorization.

28611884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 334 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 28611884 is about 5349.0077584539. The cubic root of 28611884 is about 305.8549300250.

The spelling of 28611884 in words is "twenty-eight million, six hundred eleven thousand, eight hundred eighty-four".