28921942 has 16 divisors (see below), whose sum is σ = 49664160. Its totient is φ = 12374208.

The previous prime is 28921939. The next prime is 28921969. The reversal of 28921942 is 24912982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9234 + ... + 11962.

It is an arithmetic number, because the mean of its divisors is an integer number (3104010).

Almost surely, 2^28921942 is an apocalyptic number.

28921942 is a deficient number, since it is larger than the sum of its proper divisors (20742218).

28921942 is a wasteful number, since it uses less digits than its factorization.

28921942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495.

The product of its digits is 20736, while the sum is 37.

The square root of 28921942 is about 5377.9124202612. The cubic root of 28921942 is about 306.9557809605.

The spelling of 28921942 in words is "twenty-eight million, nine hundred twenty-one thousand, nine hundred forty-two".