28971522 has 24 divisors (see below), whose sum is σ = 64937340. Its totient is φ = 9324000.

The previous prime is 28971521. The next prime is 28971529. The reversal of 28971522 is 22517982.

It can be written as a sum of positive squares in 2 ways, for example, as 27973521 + 998001 = 5289^2 + 999^2 .

It is not an unprimeable number, because it can be changed into a prime (28971521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27229 + ... + 28272.

Almost surely, 2^28971522 is an apocalyptic number.

28971522 is an abundant number, since it is smaller than the sum of its proper divisors (35965818).

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

28971522 is a wasteful number, since it uses less digits than its factorization.

28971522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55538 (or 55535 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28971522 is about 5382.5200417648. The cubic root of 28971522 is about 307.1310824609.

The spelling of 28971522 in words is "twenty-eight million, nine hundred seventy-one thousand, five hundred twenty-two".