28251949 has 16 divisors (see below), whose sum is σ = 31584384. Its totient is φ = 25056000.

The previous prime is 28251907. The next prime is 28251953. The reversal of 28251949 is 94915282.

It is a cyclic number.

It is not a de Polignac number, because 28251949 - 2¹⁷ = 28120877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28251049) 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, 121137 + ... + 121369.

It is an arithmetic number, because the mean of its divisors is an integer number (1974024).

Almost surely, 2^28251949 is an apocalyptic number.

It is an amenable number.

28251949 is a deficient number, since it is larger than the sum of its proper divisors (3332435).

28251949 is a wasteful number, since it uses less digits than its factorization.

28251949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

The product of its digits is 51840, while the sum is 40.

The square root of 28251949 is about 5315.2562497024. The cubic root of 28251949 is about 304.5669712658.

It can be divided in two parts, 2825 and 1949, that added together give a palindrome (4774).

The spelling of 28251949 in words is "twenty-eight million, two hundred fifty-one thousand, nine hundred forty-nine".