28021522 has 8 divisors (see below), whose sum is σ = 42128496. Its totient is φ = 13978692.

The previous prime is 28021507. The next prime is 28021529. The reversal of 28021522 is 22512082.

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

It is a junction number, because it is equal to n+sod(n) for n = 28021493 and 28021502.

It is not an unprimeable number, because it can be changed into a prime (28021529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14928 + ... + 16699.

It is an arithmetic number, because the mean of its divisors is an integer number (5266062).

Almost surely, 2^28021522 is an apocalyptic number.

28021522 is a deficient number, since it is larger than the sum of its proper divisors (14106974).

28021522 is a wasteful number, since it uses less digits than its factorization.

28021522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32072.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 28021522 is about 5293.5358693410. The cubic root of 28021522 is about 303.7366790096.

The spelling of 28021522 in words is "twenty-eight million, twenty-one thousand, five hundred twenty-two".