28697816 has 64 divisors (see below), whose sum is σ = 64757760. Its totient is φ = 11664000.

The previous prime is 28697803. The next prime is 28697821. The reversal of 28697816 is 61879682.

28697816 is nontrivially palindromic in base 3.

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, 105761 + ... + 106031.

It is an arithmetic number, because the mean of its divisors is an integer number (1011840).

Almost surely, 2^28697816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28697816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32378880).

28697816 is an abundant number, since it is smaller than the sum of its proper divisors (36059944).

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

28697816 is a wasteful number, since it uses less digits than its factorization.

28697816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 372 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 28697816 is about 5357.0342541373. The cubic root of 28697816 is about 306.1608222367.

The spelling of 28697816 in words is "twenty-eight million, six hundred ninety-seven thousand, eight hundred sixteen".