28399477 has 2 divisors, whose sum is σ = 28399478. Its totient is φ = 28399476.

The previous prime is 28399463. The next prime is 28399487. The reversal of 28399477 is 77499382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28313041 + 86436 = 5321^2 + 294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28399477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28399477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28399447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14199738 + 14199739.

It is an arithmetic number, because the mean of its divisors is an integer number (14199739).

Almost surely, 2^28399477 is an apocalyptic number.

It is an amenable number.

28399477 is a deficient number, since it is larger than the sum of its proper divisors (1).

28399477 is an equidigital number, since it uses as much as digits as its factorization.

28399477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 28399477 is about 5329.1159679632. The cubic root of 28399477 is about 305.0961875248.

The spelling of 28399477 in words is "twenty-eight million, three hundred ninety-nine thousand, four hundred seventy-seven".