28149507 has 12 divisors (see below), whose sum is σ = 42800680. Its totient is φ = 17778528.

The previous prime is 28149503. The next prime is 28149529. The reversal of 28149507 is 70594182.

28149507 is a `hidden beast` number, since 2 + 8 + 149 + 507 = 666.

It is not a de Polignac number, because 28149507 - 2² = 28149503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28149503) 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, 82138 + ... + 82479.

Almost surely, 2^28149507 is an apocalyptic number.

28149507 is a deficient number, since it is larger than the sum of its proper divisors (14651173).

28149507 is a wasteful number, since it uses less digits than its factorization.

28149507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164642 (or 164639 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28149507 is about 5305.6108979080. The cubic root of 28149507 is about 304.1984039276.

It can be divided in two parts, 2814 and 9507, that added together give a palindrome (12321).

The spelling of 28149507 in words is "twenty-eight million, one hundred forty-nine thousand, five hundred seven".