55261644 has 12 divisors (see below), whose sum is σ = 128943864. Its totient is φ = 18420544.

The previous prime is 55261631. The next prime is 55261651. The reversal of 55261644 is 44616255.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2302557 + ... + 2302580.

It is an arithmetic number, because the mean of its divisors is an integer number (10745322).

Almost surely, 2^55261644 is an apocalyptic number.

It is an amenable number.

55261644 is an abundant number, since it is smaller than the sum of its proper divisors (73682220).

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

55261644 is a wasteful number, since it uses less digits than its factorization.

55261644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4605144 (or 4605142 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 55261644 is about 7433.8175925967. The cubic root of 55261644 is about 380.8973345771.

Adding to 55261644 its reverse (44616255), we get a palindrome (99877899).

The spelling of 55261644 in words is "fifty-five million, two hundred sixty-one thousand, six hundred forty-four".