28162691 has 2 divisors, whose sum is σ = 28162692. Its totient is φ = 28162690.

The previous prime is 28162681. The next prime is 28162697. The reversal of 28162691 is 19626182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28162691 - 2²² = 23968387 is a prime.

It is a super-2 number, since 2×28162691² = 1586274328722962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28162697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081345 + 14081346.

It is an arithmetic number, because the mean of its divisors is an integer number (14081346).

Almost surely, 2^28162691 is an apocalyptic number.

28162691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28162691 is an equidigital number, since it uses as much as digits as its factorization.

28162691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 28162691 is about 5306.8532107078. The cubic root of 28162691 is about 304.2458875987.

The spelling of 28162691 in words is "twenty-eight million, one hundred sixty-two thousand, six hundred ninety-one".