55234640 has 20 divisors (see below), whose sum is σ = 128420724. Its totient is φ = 22093824.

The previous prime is 55234609. The next prime is 55234643. The reversal of 55234640 is 4643255.

It can be written as a sum of positive squares in 2 ways, for example, as 19855936 + 35378704 = 4456^2 + 5948^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55234643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345137 + ... + 345296.

Almost surely, 2^55234640 is an apocalyptic number.

It is an amenable number.

55234640 is an abundant number, since it is smaller than the sum of its proper divisors (73186084).

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

55234640 is a wasteful number, since it uses less digits than its factorization.

55234640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690446 (or 690440 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 55234640 is about 7432.0010764262. The cubic root of 55234640 is about 380.8352817273.

Adding to 55234640 its reverse (4643255), we get a palindrome (59877895).

The spelling of 55234640 in words is "fifty-five million, two hundred thirty-four thousand, six hundred forty".