55400643 has 24 divisors (see below), whose sum is σ = 83229120. Its totient is φ = 35468160.

The previous prime is 55400617. The next prime is 55400651. The reversal of 55400643 is 34600455.

55400643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55400643 - 2¹² = 55396547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55400663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60358 + ... + 61268.

It is an arithmetic number, because the mean of its divisors is an integer number (3467880).

Almost surely, 2^55400643 is an apocalyptic number.

55400643 is a deficient number, since it is larger than the sum of its proper divisors (27828477).

55400643 is a wasteful number, since it uses less digits than its factorization.

55400643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 55400643 is about 7443.1608205117. The cubic root of 55400643 is about 381.2164228066.

The spelling of 55400643 in words is "fifty-five million, four hundred thousand, six hundred forty-three".