28136949 has 4 divisors (see below), whose sum is σ = 37515936. Its totient is φ = 18757964.

The previous prime is 28136903. The next prime is 28136951. The reversal of 28136949 is 94963182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28136949 - 2⁷ = 28136821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28136949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28136149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4689489 + ... + 4689494.

It is an arithmetic number, because the mean of its divisors is an integer number (9378984).

Almost surely, 2^28136949 is an apocalyptic number.

It is an amenable number.

28136949 is a deficient number, since it is larger than the sum of its proper divisors (9378987).

28136949 is an equidigital number, since it uses as much as digits as its factorization.

28136949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9378986.

The product of its digits is 93312, while the sum is 42.

The square root of 28136949 is about 5304.4273017923. The cubic root of 28136949 is about 304.1531610775.

The spelling of 28136949 in words is "twenty-eight million, one hundred thirty-six thousand, nine hundred forty-nine".