28551100 has 36 divisors (see below), whose sum is σ = 63136584. Its totient is φ = 11202880.

The previous prime is 28551023. The next prime is 28551101. The reversal of 28551100 is 115582.

It is a super-2 number, since 2×28551100² = 1630330622420000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28551101) 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, 2607 + ... + 7993.

It is an arithmetic number, because the mean of its divisors is an integer number (1753794).

Almost surely, 2^28551100 is an apocalyptic number.

28551100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28551100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31568292).

28551100 is an abundant number, since it is smaller than the sum of its proper divisors (34585484).

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

28551100 is a wasteful number, since it uses less digits than its factorization.

28551100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5454 (or 5447 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 28551100 is about 5343.3229361512. The cubic root of 28551100 is about 305.6381871407.

Adding to 28551100 its reverse (115582), we get a palindrome (28666682).

The spelling of 28551100 in words is "twenty-eight million, five hundred fifty-one thousand, one hundred".