28697812 has 36 divisors (see below), whose sum is σ = 59461108. Its totient is φ = 12038400.

The previous prime is 28697803. The next prime is 28697821. The reversal of 28697812 is 21879682.

28697812 = T₃₂₈ + T₃₂₉ + ... + T₅₉₁.

28697812 is nontrivially palindromic in base 3.

It is an interprime number because it is at equal distance from previous prime (28697803) and next prime (28697821).

It can be written as a sum of positive squares in 2 ways, for example, as 6739216 + 21958596 = 2596^2 + 4686^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4012 + ... + 8572.

Almost surely, 2^28697812 is an apocalyptic number.

28697812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28697812 is an abundant number, since it is smaller than the sum of its proper divisors (30763296).

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

28697812 is a wasteful number, since it uses less digits than its factorization.

28697812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600 (or 4587 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 28697812 is about 5357.0338807963. The cubic root of 28697812 is about 306.1608080122.

The spelling of 28697812 in words is "twenty-eight million, six hundred ninety-seven thousand, eight hundred twelve".