55971840 has 104 divisors (see below), whose sum is σ = 179284608. Its totient is φ = 14909440.

The previous prime is 55971809. The next prime is 55971841. The reversal of 55971840 is 4817955.

It is not an unprimeable number, because it can be changed into a prime (55971841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60985 + ... + 61895.

Almost surely, 2^55971840 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 55971840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89642304).

55971840 is an abundant number, since it is smaller than the sum of its proper divisors (123312768).

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

55971840 is an equidigital number, since it uses as much as digits as its factorization.

55971840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 55971840 is about 7481.4330178115. The cubic root of 55971840 is about 382.5220970617.

The spelling of 55971840 in words is "fifty-five million, nine hundred seventy-one thousand, eight hundred forty".