55591740 has 108 divisors (see below), whose sum is σ = 173503512. Its totient is φ = 14405760.

The previous prime is 55591721. The next prime is 55591807. The reversal of 55591740 is 4719555.

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 = 55591695 and 55591704.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 669739 + ... + 669821.

It is an arithmetic number, because the mean of its divisors is an integer number (1606514).

Almost surely, 2^55591740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55591740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86751756).

55591740 is an abundant number, since it is smaller than the sum of its proper divisors (117911772).

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

55591740 is a wasteful number, since it uses less digits than its factorization.

55591740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 55591740 is about 7455.9868562116. The cubic root of 55591740 is about 381.6542379033.

The spelling of 55591740 in words is "fifty-five million, five hundred ninety-one thousand, seven hundred forty".