28697814 has 32 divisors (see below), whose sum is σ = 64570080. Its totient is φ = 9565938.

The previous prime is 28697803. The next prime is 28697821. The reversal of 28697814 is 41879682.

It is a Curzon number.

It is a nialpdrome in base 3 and base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 28697814.

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, 9565937 + 9565938 + 9565939.

It is an arithmetic number, because the mean of its divisors is an integer number (2017815).

Almost surely, 2^28697814 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28697814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32285040).

28697814 is an abundant number, since it is smaller than the sum of its proper divisors (35872266).

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

28697814 is an frugal number, since it uses more digits than its factorization.

28697814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47 (or 5 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28697814 is about 5357.0340674668. The cubic root of 28697814 is about 306.1608151245.

The spelling of 28697814 in words is "twenty-eight million, six hundred ninety-seven thousand, eight hundred fourteen".