55743840 has 72 divisors (see below), whose sum is σ = 190230768. Its totient is φ = 14864640.

The previous prime is 55743839. The next prime is 55743841. The reversal of 55743840 is 4834755.

55743840 is a `hidden beast` number, since 5 + 574 + 3 + 84 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (55743839) and next prime (55743841).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55743795 and 55743804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55743841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17916 + ... + 20795.

It is an arithmetic number, because the mean of its divisors is an integer number (2642094).

Almost surely, 2^55743840 is an apocalyptic number.

It is an amenable number.

55743840 is an abundant number, since it is smaller than the sum of its proper divisors (134486928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55743840 is a wasteful number, since it uses less digits than its factorization.

55743840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38732 (or 38721 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 55743840 is about 7466.1797460281. The cubic root of 55743840 is about 382.0019918941.

The spelling of 55743840 in words is "fifty-five million, seven hundred forty-three thousand, eight hundred forty".