28306761 has 16 divisors (see below), whose sum is σ = 44016000. Its totient is φ = 16174704.

The previous prime is 28306757. The next prime is 28306793. The reversal of 28306761 is 16760382.

It is not a de Polignac number, because 28306761 - 2² = 28306757 is a prime.

It is a super-2 number, since 2×28306761² = 1602545436622242, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28306711) 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, 12726 + ... + 14783.

It is an arithmetic number, because the mean of its divisors is an integer number (2751000).

Almost surely, 2^28306761 is an apocalyptic number.

28306761 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28306761 is a deficient number, since it is larger than the sum of its proper divisors (15709239).

28306761 is an equidigital number, since it uses as much as digits as its factorization.

28306761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27533 (or 27519 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 28306761 is about 5320.4098526335. The cubic root of 28306761 is about 304.7638089000.

It can be divided in two parts, 283067 and 61, that added together give a triangular number (283128 = T₇₅₂).

The spelling of 28306761 in words is "twenty-eight million, three hundred six thousand, seven hundred sixty-one".