28145977 has 2 divisors, whose sum is σ = 28145978. Its totient is φ = 28145976.

The previous prime is 28145941. The next prime is 28145987. The reversal of 28145977 is 77954182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 467856 = 5261^2 + 684^2 .

It is a cyclic number.

It is not a de Polignac number, because 28145977 - 2⁷ = 28145849 is a prime.

It is not a weakly prime, because it can be changed into another prime (28145987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14072988 + 14072989.

It is an arithmetic number, because the mean of its divisors is an integer number (14072989).

Almost surely, 2^28145977 is an apocalyptic number.

It is an amenable number.

28145977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28145977 is an equidigital number, since it uses as much as digits as its factorization.

28145977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 28145977 is about 5305.2782207911. The cubic root of 28145977 is about 304.1856877161.

The spelling of 28145977 in words is "twenty-eight million, one hundred forty-five thousand, nine hundred seventy-seven".