28137966 has 8 divisors (see below), whose sum is σ = 56275944. Its totient is φ = 9379320.

The previous prime is 28137943. The next prime is 28137971. The reversal of 28137966 is 66973182.

It is a happy number.

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

28137966 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2344825 + ... + 2344836.

It is an arithmetic number, because the mean of its divisors is an integer number (7034493).

Almost surely, 2^28137966 is an apocalyptic number.

28137966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28137966 is a wasteful number, since it uses less digits than its factorization.

28137966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689666.

The product of its digits is 108864, while the sum is 42.

The square root of 28137966 is about 5304.5231642439. The cubic root of 28137966 is about 304.1568255359.

The spelling of 28137966 in words is "twenty-eight million, one hundred thirty-seven thousand, nine hundred sixty-six".