28697808 has 40 divisors (see below), whose sum is σ = 74339488. Its totient is φ = 9539712.

The previous prime is 28697803. The next prime is 28697821. The reversal of 28697808 is 80879682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28697803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25710 + ... + 26802.

Almost surely, 2^28697808 is an apocalyptic number.

It is an amenable number.

28697808 is an abundant number, since it is smaller than the sum of its proper divisors (45641680).

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

28697808 is a wasteful number, since it uses less digits than its factorization.

28697808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 28697808 is about 5357.0335074554. The cubic root of 28697808 is about 306.1607937876.

28697808 divided by its sum of digits (48) gives a triangular number (597871 = T₁₀₉₃).

The spelling of 28697808 in words is "twenty-eight million, six hundred ninety-seven thousand, eight hundred eight".