28137785 has 16 divisors (see below), whose sum is σ = 36542016. Its totient is φ = 20676288.

The previous prime is 28137773. The next prime is 28137787. The reversal of 28137785 is 58773182.

It is a cyclic number.

It is not a de Polignac number, because 28137785 - 2⁶ = 28137721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28137787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13802 + ... + 15708.

It is an arithmetic number, because the mean of its divisors is an integer number (2283876).

Almost surely, 2^28137785 is an apocalyptic number.

It is an amenable number.

28137785 is a deficient number, since it is larger than the sum of its proper divisors (8404231).

28137785 is a wasteful number, since it uses less digits than its factorization.

28137785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152.

The product of its digits is 94080, while the sum is 41.

The square root of 28137785 is about 5304.5061033050. The cubic root of 28137785 is about 304.1561733625.

The spelling of 28137785 in words is "twenty-eight million, one hundred thirty-seven thousand, seven hundred eighty-five".