55640012 has 6 divisors (see below), whose sum is σ = 97370028. Its totient is φ = 27820004.

The previous prime is 55639981. The next prime is 55640033. The reversal of 55640012 is 21004655.

It is a self number, because there is not a number n which added to its sum of digits gives 55640012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6954998 + ... + 6955005.

It is an arithmetic number, because the mean of its divisors is an integer number (16228338).

Almost surely, 2^55640012 is an apocalyptic number.

It is an amenable number.

55640012 is a deficient number, since it is larger than the sum of its proper divisors (41730016).

55640012 is a wasteful number, since it uses less digits than its factorization.

55640012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13910007 (or 13910005 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55640012 is about 7459.2232839619. The cubic root of 55640012 is about 381.7646732753.

Adding to 55640012 its reverse (21004655), we get a palindrome (76644667).

The spelling of 55640012 in words is "fifty-five million, six hundred forty thousand, twelve".