28731992 has 8 divisors (see below), whose sum is σ = 53872500. Its totient is φ = 14365992.

The previous prime is 28731977. The next prime is 28732001. The reversal of 28731992 is 29913782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1795742 + ... + 1795757.

Almost surely, 2^28731992 is an apocalyptic number.

It is an amenable number.

28731992 is a deficient number, since it is larger than the sum of its proper divisors (25140508).

28731992 is a wasteful number, since it uses less digits than its factorization.

28731992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591505 (or 3591501 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 28731992 is about 5360.2231296841. The cubic root of 28731992 is about 306.2823088501.

The spelling of 28731992 in words is "twenty-eight million, seven hundred thirty-one thousand, nine hundred ninety-two".