55442642 has 4 divisors (see below), whose sum is σ = 83163966. Its totient is φ = 27721320.

The previous prime is 55442641. The next prime is 55442669. The reversal of 55442642 is 24624455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45144961 + 10297681 = 6719^2 + 3209^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55442599 and 55442608.

It is not an unprimeable number, because it can be changed into a prime (55442641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860659 + ... + 13860662.

Almost surely, 2^55442642 is an apocalyptic number.

55442642 is a deficient number, since it is larger than the sum of its proper divisors (27721324).

55442642 is a wasteful number, since it uses less digits than its factorization.

55442642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27721323.

The product of its digits is 38400, while the sum is 32.

The square root of 55442642 is about 7445.9816008368. The cubic root of 55442642 is about 381.3127313420.

The spelling of 55442642 in words is "fifty-five million, four hundred forty-two thousand, six hundred forty-two".