28731966 has 8 divisors (see below), whose sum is σ = 57463944. Its totient is φ = 9577320.

The previous prime is 28731949. The next prime is 28731973. The reversal of 28731966 is 66913782.

It is a happy number.

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

28731966 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, 2394325 + ... + 2394336.

It is an arithmetic number, because the mean of its divisors is an integer number (7182993).

Almost surely, 2^28731966 is an apocalyptic number.

28731966 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.

28731966 is a wasteful number, since it uses less digits than its factorization.

28731966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4788666.

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

The square root of 28731966 is about 5360.2207044113. The cubic root of 28731966 is about 306.2822164637.

The spelling of 28731966 in words is "twenty-eight million, seven hundred thirty-one thousand, nine hundred sixty-six".