28011000 has 64 divisors (see below), whose sum is σ = 87403680. Its totient is φ = 7468800.

The previous prime is 28010971. The next prime is 28011023. The reversal of 28011000 is 11082.

It is a happy number.

It is a super-2 number, since 2×28011000² = 1569232242000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1669 + ... + 7668.

Almost surely, 2^28011000 is an apocalyptic number.

28011000 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 28011000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43701840).

28011000 is an abundant number, since it is smaller than the sum of its proper divisors (59392680).

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

28011000 is a wasteful number, since it uses less digits than its factorization.

28011000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9361 (or 9347 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 28011000 is about 5292.5419223658. The cubic root of 28011000 is about 303.6986568370.

Adding to 28011000 its reverse (11082), we get a palindrome (28022082).

The spelling of 28011000 in words is "twenty-eight million, eleven thousand".