28722442 has 16 divisors (see below), whose sum is σ = 49338432. Its totient is φ = 12284640.

The previous prime is 28722437. The next prime is 28722443. The reversal of 28722442 is 24422782.

It is not an unprimeable number, because it can be changed into a prime (28722443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6198 + ... + 9790.

It is an arithmetic number, because the mean of its divisors is an integer number (3083652).

Almost surely, 2^28722442 is an apocalyptic number.

28722442 is a deficient number, since it is larger than the sum of its proper divisors (20615990).

28722442 is a wasteful number, since it uses less digits than its factorization.

28722442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173.

The product of its digits is 14336, while the sum is 31.

The square root of 28722442 is about 5359.3322345233. The cubic root of 28722442 is about 306.2483708368.

The spelling of 28722442 in words is "twenty-eight million, seven hundred twenty-two thousand, four hundred forty-two".