55209664 has 14 divisors (see below), whose sum is σ = 109556804. Its totient is φ = 27604800.

The previous prime is 55209619. The next prime is 55209673. The reversal of 55209664 is 46690255.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431262 + ... + 431389.

It is an arithmetic number, because the mean of its divisors is an integer number (7825486).

Almost surely, 2^55209664 is an apocalyptic number.

It is an amenable number.

55209664 is a deficient number, since it is larger than the sum of its proper divisors (54347140).

55209664 is an equidigital number, since it uses as much as digits as its factorization.

55209664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862663 (or 862653 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 55209664 is about 7430.3205852776. The cubic root of 55209664 is about 380.7778710395. Note that the first 3 decimals are identical.

The spelling of 55209664 in words is "fifty-five million, two hundred nine thousand, six hundred sixty-four".