28211677 has 8 divisors (see below), whose sum is σ = 30563960. Its totient is φ = 26039520.

The previous prime is 28211671. The next prime is 28211683. The reversal of 28211677 is 77611282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28211671) and next prime (28211683).

It can be written as a sum of positive squares in 4 ways, for example, as 9036036 + 19175641 = 3006^2 + 4379^2 .

It is not a de Polignac number, because 28211677 - 2³ = 28211669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4224 + ... + 8617.

It is an arithmetic number, because the mean of its divisors is an integer number (3820495).

Almost surely, 2^28211677 is an apocalyptic number.

It is an amenable number.

28211677 is a deficient number, since it is larger than the sum of its proper divisors (2352283).

28211677 is an equidigital number, since it uses as much as digits as its factorization.

28211677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12880 (or 12854 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 28211677 is about 5311.4665583057. The cubic root of 28211677 is about 304.4221865209.

The spelling of 28211677 in words is "twenty-eight million, two hundred eleven thousand, six hundred seventy-seven".