28993722 has 8 divisors (see below), whose sum is σ = 57987456. Its totient is φ = 9664572.

The previous prime is 28993717. The next prime is 28993733. The reversal of 28993722 is 22739982.

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

28993722 is an admirable 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, 2416138 + ... + 2416149.

It is an arithmetic number, because the mean of its divisors is an integer number (7248432).

Almost surely, 2^28993722 is an apocalyptic number.

28993722 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.

28993722 is a wasteful number, since it uses less digits than its factorization.

28993722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4832292.

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

The square root of 28993722 is about 5384.5818779177. The cubic root of 28993722 is about 307.2095108478.

The spelling of 28993722 in words is "twenty-eight million, nine hundred ninety-three thousand, seven hundred twenty-two".