28742872 has 8 divisors (see below), whose sum is σ = 53892900. Its totient is φ = 14371432.

The previous prime is 28742867. The next prime is 28742873. The reversal of 28742872 is 27824782.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742873) 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 as a sum of consecutive naturals, namely, 1796422 + ... + 1796437.

Almost surely, 2^28742872 is an apocalyptic number.

It is an amenable number.

28742872 is a deficient number, since it is larger than the sum of its proper divisors (25150028).

28742872 is a wasteful number, since it uses less digits than its factorization.

28742872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592865 (or 3592861 counting only the distinct ones).

The product of its digits is 100352, while the sum is 40.

The square root of 28742872 is about 5361.2379167502. The cubic root of 28742872 is about 306.3209641464.

The spelling of 28742872 in words is "twenty-eight million, seven hundred forty-two thousand, eight hundred seventy-two".