28787185 has 32 divisors (see below), whose sum is σ = 42197760. Its totient is φ = 18413568.

The previous prime is 28787183. The next prime is 28787203. The reversal of 28787185 is 58178782.

It is a happy number.

It is a 3-Lehmer number, since φ(28787185) divides (28787185-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 28787185 - 2¹ = 28787183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28787183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48249 + ... + 48841.

It is an arithmetic number, because the mean of its divisors is an integer number (1318680).

It is a Poulet number, since it divides 2^28787184-1.

Almost surely, 2^28787185 is an apocalyptic number.

It is an amenable number.

28787185 is a deficient number, since it is larger than the sum of its proper divisors (13410575).

28787185 is a wasteful number, since it uses less digits than its factorization.

28787185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697.

The product of its digits is 250880, while the sum is 46.

The square root of 28787185 is about 5365.3690460210. The cubic root of 28787185 is about 306.4783020672.

The spelling of 28787185 in words is "twenty-eight million, seven hundred eighty-seven thousand, one hundred eighty-five".