28149687 has 20 divisors (see below), whose sum is σ = 42322896. Its totient is φ = 18645120.

The previous prime is 28149683. The next prime is 28149701. The reversal of 28149687 is 78694182.

28149687 is a `hidden beast` number, since 2 + 81 + 496 + 87 = 666.

It is not a de Polignac number, because 28149687 - 2² = 28149683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28149683) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12487 + ... + 14567.

Almost surely, 2^28149687 is an apocalyptic number.

28149687 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28149687 is a deficient number, since it is larger than the sum of its proper divisors (14173209).

28149687 is a wasteful number, since it uses less digits than its factorization.

28149687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260 (or 2251 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28149687 is about 5305.6278610547. The cubic root of 28149687 is about 304.1990523178.

The spelling of 28149687 in words is "twenty-eight million, one hundred forty-nine thousand, six hundred eighty-seven".