28733749 has 12 divisors (see below), whose sum is σ = 32025868. Its totient is φ = 25755840.

The previous prime is 28733717. The next prime is 28733759. The reversal of 28733749 is 94733782.

It can be written as a sum of positive squares in 2 ways, for example, as 24502500 + 4231249 = 4950^2 + 2057^2 .

It is not a de Polignac number, because 28733749 - 2⁵ = 28733717 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 (28733759) 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, 7207 + ... + 10459.

Almost surely, 2^28733749 is an apocalyptic number.

It is an amenable number.

28733749 is a deficient number, since it is larger than the sum of its proper divisors (3292119).

28733749 is a wasteful number, since it uses less digits than its factorization.

28733749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348 (or 3337 counting only the distinct ones).

The product of its digits is 254016, while the sum is 43.

The square root of 28733749 is about 5360.3870196097. The cubic root of 28733749 is about 306.2885519147.

The spelling of 28733749 in words is "twenty-eight million, seven hundred thirty-three thousand, seven hundred forty-nine".