55517442 has 16 divisors (see below), whose sum is σ = 112855872. Its totient is φ = 18202320.

The previous prime is 55517431. The next prime is 55517443. The reversal of 55517442 is 24471555.

It is not an unprimeable number, because it can be changed into a prime (55517443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75478 + ... + 76209.

It is an arithmetic number, because the mean of its divisors is an integer number (7053492).

Almost surely, 2^55517442 is an apocalyptic number.

55517442 is an abundant number, since it is smaller than the sum of its proper divisors (57338430).

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

55517442 is a wasteful number, since it uses less digits than its factorization.

55517442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151753.

The product of its digits is 28000, while the sum is 33.

The square root of 55517442 is about 7451.0027513080. The cubic root of 55517442 is about 381.4841359627.

Adding to 55517442 its reverse (24471555), we get a palindrome (79988997).

The spelling of 55517442 in words is "fifty-five million, five hundred seventeen thousand, four hundred forty-two".