28328637 has 8 divisors (see below), whose sum is σ = 38990080. Its totient is φ = 18276480.

The previous prime is 28328633. The next prime is 28328683. The reversal of 28328637 is 73682382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28328637 - 2² = 28328633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28328595 and 28328604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152212 + ... + 152397.

It is an arithmetic number, because the mean of its divisors is an integer number (4873760).

Almost surely, 2^28328637 is an apocalyptic number.

It is an amenable number.

28328637 is a deficient number, since it is larger than the sum of its proper divisors (10661443).

28328637 is a wasteful number, since it uses less digits than its factorization.

28328637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304643.

The product of its digits is 96768, while the sum is 39.

The square root of 28328637 is about 5322.4653122402. The cubic root of 28328637 is about 304.8422977618.

It can be divided in two parts, 283 and 28637, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28328637 in words is "twenty-eight million, three hundred twenty-eight thousand, six hundred thirty-seven".