28197700 has 36 divisors (see below), whose sum is σ = 62851012. Its totient is φ = 10972800.

The previous prime is 28197647. The next prime is 28197731. The reversal of 28197700 is 779182.

It can be written as a sum of positive squares in 6 ways, for example, as 2553604 + 25644096 = 1598^2 + 5064^2 .

It is a super-2 number, since 2×28197700² = 1590220570580000, which contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 111 + ... + 7510.

Almost surely, 2^28197700 is an apocalyptic number.

28197700 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 28197700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31425506).

28197700 is an abundant number, since it is smaller than the sum of its proper divisors (34653312).

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

28197700 is a wasteful number, since it uses less digits than its factorization.

28197700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7672 (or 7665 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 28197700 is about 5310.1506569965. The cubic root of 28197700 is about 304.3719046019.

The spelling of 28197700 in words is "twenty-eight million, one hundred ninety-seven thousand, seven hundred".