55742120 has 64 divisors (see below), whose sum is σ = 144132480. Its totient is φ = 19005696.

The previous prime is 55742119. The next prime is 55742129. The reversal of 55742120 is 2124755.

It is a self number, because there is not a number n which added to its sum of digits gives 55742120.

It is not an unprimeable number, because it can be changed into a prime (55742129) 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, 63122 + ... + 63998.

It is an arithmetic number, because the mean of its divisors is an integer number (2252070).

Almost surely, 2^55742120 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 55742120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72066240).

55742120 is an abundant number, since it is smaller than the sum of its proper divisors (88390360).

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

55742120 is a wasteful number, since it uses less digits than its factorization.

55742120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 55742120 is about 7466.0645590565. The cubic root of 55742120 is about 381.9980629088.

Adding to 55742120 its reverse (2124755), we get a palindrome (57866875).

The spelling of 55742120 in words is "fifty-five million, seven hundred forty-two thousand, one hundred twenty".