55811740 has 48 divisors (see below), whose sum is σ = 124175520. Its totient is φ = 21012480.

The previous prime is 55811729. The next prime is 55811741. The reversal of 55811740 is 4711855.

It is a super-2 number, since 2×55811740² = 6229900643655200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55811741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72960 + ... + 73720.

It is an arithmetic number, because the mean of its divisors is an integer number (2586990).

Almost surely, 2^55811740 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 55811740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62087760).

55811740 is an abundant number, since it is smaller than the sum of its proper divisors (68363780).

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

55811740 is a wasteful number, since it uses less digits than its factorization.

55811740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 55811740 is about 7470.7255337082. The cubic root of 55811740 is about 382.1570309139.

The spelling of 55811740 in words is "fifty-five million, eight hundred eleven thousand, seven hundred forty".