28200690 has 128 divisors (see below), whose sum is σ = 88197120. Its totient is φ = 6277824.

The previous prime is 28200677. The next prime is 28200721. The reversal of 28200690 is 9600282.

It is a super-2 number, since 2×28200690² = 1590557832952200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81097 + ... + 81443.

It is an arithmetic number, because the mean of its divisors is an integer number (689040).

Almost surely, 2^28200690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28200690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44098560).

28200690 is an abundant number, since it is smaller than the sum of its proper divisors (59996430).

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

28200690 is a wasteful number, since it uses less digits than its factorization.

28200690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28200690 is about 5310.4321858018. The cubic root of 28200690 is about 304.3826624513.

The spelling of 28200690 in words is "twenty-eight million, two hundred thousand, six hundred ninety".