28737222 has 16 divisors (see below), whose sum is σ = 58417392. Its totient is φ = 9421920.

The previous prime is 28737211. The next prime is 28737223. The reversal of 28737222 is 22273782.

28737222 is nontrivially palindromic in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28737223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38893 + ... + 39624.

It is an arithmetic number, because the mean of its divisors is an integer number (3651087).

Almost surely, 2^28737222 is an apocalyptic number.

28737222 is an abundant number, since it is smaller than the sum of its proper divisors (29680170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28737222 is a wasteful number, since it uses less digits than its factorization.

28737222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78583.

The product of its digits is 18816, while the sum is 33.

The square root of 28737222 is about 5360.7109603111. The cubic root of 28737222 is about 306.3008916119.

The spelling of 28737222 in words is "twenty-eight million, seven hundred thirty-seven thousand, two hundred twenty-two".