28220572 has 6 divisors (see below), whose sum is σ = 49386008. Its totient is φ = 14110284.

The previous prime is 28220551. The next prime is 28220579. The reversal of 28220572 is 27502282.

It is a self number, because there is not a number n which added to its sum of digits gives 28220572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28220579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3527568 + ... + 3527575.

Almost surely, 2^28220572 is an apocalyptic number.

It is an amenable number.

28220572 is a deficient number, since it is larger than the sum of its proper divisors (21165436).

28220572 is a wasteful number, since it uses less digits than its factorization.

28220572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7055147 (or 7055145 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 28220572 is about 5312.3038316723. The cubic root of 28220572 is about 304.4541774208.

The spelling of 28220572 in words is "twenty-eight million, two hundred twenty thousand, five hundred seventy-two".