28722434 has 32 divisors (see below), whose sum is σ = 48422640. Its totient is φ = 12690432.

The previous prime is 28722373. The next prime is 28722437. The reversal of 28722434 is 43422782.

It can be written as a sum of positive squares in 8 ways, for example, as 22705225 + 6017209 = 4765^2 + 2453^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28722434.

It is not an unprimeable number, because it can be changed into a prime (28722437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70022 + ... + 70430.

Almost surely, 2^28722434 is an apocalyptic number.

28722434 is a deficient number, since it is larger than the sum of its proper divisors (19700206).

28722434 is a wasteful number, since it uses less digits than its factorization.

28722434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534.

The product of its digits is 21504, while the sum is 32.

The square root of 28722434 is about 5359.3314881616. The cubic root of 28722434 is about 306.2483424039.

The spelling of 28722434 in words is "twenty-eight million, seven hundred twenty-two thousand, four hundred thirty-four".