28284690 has 48 divisors (see below), whose sum is σ = 77792832. Its totient is φ = 6447456.

The previous prime is 28284677. The next prime is 28284709. The reversal of 28284690 is 9648282.

It is a super-2 number, since 2×28284690² = 1600047376792200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76887 + ... + 77253.

It is an arithmetic number, because the mean of its divisors is an integer number (1620684).

Almost surely, 2^28284690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28284690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38896416).

28284690 is an abundant number, since it is smaller than the sum of its proper divisors (49508142).

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

28284690 is an equidigital number, since it uses as much as digits as its factorization.

28284690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28284690 is about 5318.3352658515. The cubic root of 28284690 is about 304.6845794066.

The spelling of 28284690 in words is "twenty-eight million, two hundred eighty-four thousand, six hundred ninety".