28820036 has 72 divisors (see below), whose sum is σ = 63201600. Its totient is φ = 11430720.

The previous prime is 28820023. The next prime is 28820039. The reversal of 28820036 is 63002882.

It is a junction number, because it is equal to n+sod(n) for n = 28819990 and 28820008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820039) 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, 264350 + ... + 264458.

It is an arithmetic number, because the mean of its divisors is an integer number (877800).

Almost surely, 2^28820036 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 28820036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31600800).

28820036 is an abundant number, since it is smaller than the sum of its proper divisors (34381564).

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

28820036 is a wasteful number, since it uses less digits than its factorization.

28820036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28820036 is about 5368.4295655247. The cubic root of 28820036 is about 306.5948387752.

The spelling of 28820036 in words is "twenty-eight million, eight hundred twenty thousand, thirty-six".