55405512 has 64 divisors (see below), whose sum is σ = 154872000. Its totient is φ = 18352512.

The previous prime is 55405453. The next prime is 55405517. The reversal of 55405512 is 21550455.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55405517) 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, 37948 + ... + 39380.

It is an arithmetic number, because the mean of its divisors is an integer number (2419875).

Almost surely, 2^55405512 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 55405512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77436000).

55405512 is an abundant number, since it is smaller than the sum of its proper divisors (99466488).

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

55405512 is a wasteful number, since it uses less digits than its factorization.

55405512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 55405512 is about 7443.4878921108. The cubic root of 55405512 is about 381.2275904771.

Adding to 55405512 its reverse (21550455), we get a palindrome (76955967).

The spelling of 55405512 in words is "fifty-five million, four hundred five thousand, five hundred twelve".