28920761 has 2 divisors, whose sum is σ = 28920762. Its totient is φ = 28920760.

The previous prime is 28920719. The next prime is 28920767. The reversal of 28920761 is 16702982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 13278736 = 3955^2 + 3644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28920761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28920767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14460380 + 14460381.

It is an arithmetic number, because the mean of its divisors is an integer number (14460381).

Almost surely, 2^28920761 is an apocalyptic number.

It is an amenable number.

28920761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28920761 is an equidigital number, since it uses as much as digits as its factorization.

28920761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 28920761 is about 5377.8026181704. The cubic root of 28920761 is about 306.9516028211.

The spelling of 28920761 in words is "twenty-eight million, nine hundred twenty thousand, seven hundred sixty-one".