28722534 has 8 divisors (see below), whose sum is σ = 57445080. Its totient is φ = 9574176.

The previous prime is 28722517. The next prime is 28722539. The reversal of 28722534 is 43522782.

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

28722534 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 28722495 and 28722504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28722539) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2393539 + ... + 2393550.

It is an arithmetic number, because the mean of its divisors is an integer number (7180635).

Almost surely, 2^28722534 is an apocalyptic number.

28722534 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.

28722534 is a wasteful number, since it uses less digits than its factorization.

28722534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4787094.

The product of its digits is 26880, while the sum is 33.

The square root of 28722534 is about 5359.3408176752. The cubic root of 28722534 is about 306.2486978148.

The spelling of 28722534 in words is "twenty-eight million, seven hundred twenty-two thousand, five hundred thirty-four".