55971380 has 48 divisors (see below), whose sum is σ = 123594240. Its totient is φ = 21264768.

The previous prime is 55971373. The next prime is 55971389. The reversal of 55971380 is 8317955.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55971389) 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, 30941 + ... + 32699.

It is an arithmetic number, because the mean of its divisors is an integer number (2574880).

Almost surely, 2^55971380 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 55971380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61797120).

55971380 is an abundant number, since it is smaller than the sum of its proper divisors (67622860).

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

55971380 is a wasteful number, since it uses less digits than its factorization.

55971380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848 (or 1846 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 55971380 is about 7481.4022749749. The cubic root of 55971380 is about 382.5210491499.

The spelling of 55971380 in words is "fifty-five million, nine hundred seventy-one thousand, three hundred eighty".