28772722 has 24 divisors (see below), whose sum is σ = 47915280. Its totient is φ = 12850560.

The previous prime is 28772713. The next prime is 28772753. The reversal of 28772722 is 22727782.

It is a super-3 number, since 3×28772722³ (a number of 23 digits) contains 333 as substring.

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 in 11 ways as a sum of consecutive naturals, for example, 206929 + ... + 207067.

It is an arithmetic number, because the mean of its divisors is an integer number (1996470).

Almost surely, 2^28772722 is an apocalyptic number.

28772722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28772722 is a deficient number, since it is larger than the sum of its proper divisors (19142558).

28772722 is a wasteful number, since it uses less digits than its factorization.

28772722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 249 counting only the distinct ones).

The product of its digits is 43904, while the sum is 37.

The square root of 28772722 is about 5364.0210663270. The cubic root of 28772722 is about 306.4269674401.

The spelling of 28772722 in words is "twenty-eight million, seven hundred seventy-two thousand, seven hundred twenty-two".