55787447 has 2 divisors, whose sum is σ = 55787448. Its totient is φ = 55787446.

The previous prime is 55787441. The next prime is 55787467. The reversal of 55787447 is 74478755.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55787447 - 2¹⁸ = 55525303 is a prime.

It is a super-2 number, since 2×55787447² = 6224478485555618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55787441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27893723 + 27893724.

It is an arithmetic number, because the mean of its divisors is an integer number (27893724).

Almost surely, 2^55787447 is an apocalyptic number.

55787447 is a deficient number, since it is larger than the sum of its proper divisors (1).

55787447 is an equidigital number, since it uses as much as digits as its factorization.

55787447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1097600, while the sum is 47.

The square root of 55787447 is about 7469.0994771793. The cubic root of 55787447 is about 382.1015761055.

The spelling of 55787447 in words is "fifty-five million, seven hundred eighty-seven thousand, four hundred forty-seven".