28920277 has 2 divisors, whose sum is σ = 28920278. Its totient is φ = 28920276.

The previous prime is 28920263. The next prime is 28920301. The reversal of 28920277 is 77202982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28879876 + 40401 = 5374^2 + 201^2 .

It is a cyclic number.

It is not a de Polignac number, because 28920277 - 2⁷ = 28920149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28920257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14460138 + 14460139.

It is an arithmetic number, because the mean of its divisors is an integer number (14460139).

Almost surely, 2^28920277 is an apocalyptic number.

It is an amenable number.

28920277 is a deficient number, since it is larger than the sum of its proper divisors (1).

28920277 is an equidigital number, since it uses as much as digits as its factorization.

28920277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28920277 is about 5377.7576181899. The cubic root of 28920277 is about 306.9498904941.

The spelling of 28920277 in words is "twenty-eight million, nine hundred twenty thousand, two hundred seventy-seven".