28661892 has 48 divisors (see below), whose sum is σ = 77371392. Its totient is φ = 8088480.

The previous prime is 28661891. The next prime is 28661903. The reversal of 28661892 is 29816682.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (28661891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4917 + ... + 9027.

It is an arithmetic number, because the mean of its divisors is an integer number (1611904).

Almost surely, 2^28661892 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 28661892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38685696).

28661892 is an abundant number, since it is smaller than the sum of its proper divisors (48709500).

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

28661892 is a wasteful number, since it uses less digits than its factorization.

28661892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208 (or 4206 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 28661892 is about 5353.6802295244. The cubic root of 28661892 is about 306.0330179246.

The spelling of 28661892 in words is "twenty-eight million, six hundred sixty-one thousand, eight hundred ninety-two".