28338761 has 4 divisors (see below), whose sum is σ = 30915024. Its totient is φ = 25762500.

The previous prime is 28338733. The next prime is 28338787. The reversal of 28338761 is 16783382.

28338761 = T₁₂₉₄ + T₁₂₉₅ + ... + T₁₃₂₆.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-28338761 is a prime.

It is a super-3 number, since 3×28338761³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28338701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288115 + ... + 1288136.

It is an arithmetic number, because the mean of its divisors is an integer number (7728756).

Almost surely, 2^28338761 is an apocalyptic number.

It is an amenable number.

28338761 is a deficient number, since it is larger than the sum of its proper divisors (2576263).

28338761 is a wasteful number, since it uses less digits than its factorization.

28338761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576262.

The product of its digits is 48384, while the sum is 38.

The square root of 28338761 is about 5323.4162903158. The cubic root of 28338761 is about 304.8786079668.

The spelling of 28338761 in words is "twenty-eight million, three hundred thirty-eight thousand, seven hundred sixty-one".