28891477 has 2 divisors, whose sum is σ = 28891478. Its totient is φ = 28891476.

The previous prime is 28891469. The next prime is 28891481. The reversal of 28891477 is 77419882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 5716881 = 4814^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 28891477 - 2³ = 28891469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28891777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14445738 + 14445739.

It is an arithmetic number, because the mean of its divisors is an integer number (14445739).

Almost surely, 2^28891477 is an apocalyptic number.

It is an amenable number.

28891477 is a deficient number, since it is larger than the sum of its proper divisors (1).

28891477 is an equidigital number, since it uses as much as digits as its factorization.

28891477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 28891477 is about 5375.0792552296. The cubic root of 28891477 is about 306.8479655490.

The spelling of 28891477 in words is "twenty-eight million, eight hundred ninety-one thousand, four hundred seventy-seven".