28281572 has 36 divisors (see below), whose sum is σ = 55234368. Its totient is φ = 12658800.

The previous prime is 28281553. The next prime is 28281581. The reversal of 28281572 is 27518282.

28281572 is nontrivially palindromic in base 5.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33953 + ... + 34775.

It is an arithmetic number, because the mean of its divisors is an integer number (1534288).

Almost surely, 2^28281572 is an apocalyptic number.

28281572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28281572 is a deficient number, since it is larger than the sum of its proper divisors (26952796).

28281572 is a wasteful number, since it uses less digits than its factorization.

28281572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 907 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 28281572 is about 5318.0421209313. The cubic root of 28281572 is about 304.6733832267.

The spelling of 28281572 in words is "twenty-eight million, two hundred eighty-one thousand, five hundred seventy-two".