28012957 has 12 divisors (see below), whose sum is σ = 34504380. Its totient is φ = 22598016.

The previous prime is 28012949. The next prime is 28012967. The reversal of 28012957 is 75921082.

It can be written as a sum of positive squares in 2 ways, for example, as 13351716 + 14661241 = 3654^2 + 3829^2 .

It is not a de Polignac number, because 28012957 - 2³ = 28012949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28012967) 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, 15982 + ... + 17647.

It is an arithmetic number, because the mean of its divisors is an integer number (2875365).

Almost surely, 2^28012957 is an apocalyptic number.

It is an amenable number.

28012957 is a deficient number, since it is larger than the sum of its proper divisors (6491423).

28012957 is a wasteful number, since it uses less digits than its factorization.

28012957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33660 (or 33653 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28012957 is about 5292.7268019425. The cubic root of 28012957 is about 303.7057293493.

The spelling of 28012957 in words is "twenty-eight million, twelve thousand, nine hundred fifty-seven".