55621670 has 16 divisors (see below), whose sum is σ = 107820720. Its totient is φ = 20537184.

The previous prime is 55621663. The next prime is 55621673. The reversal of 55621670 is 7612655.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55621673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213800 + ... + 214059.

It is an arithmetic number, because the mean of its divisors is an integer number (6738795).

Almost surely, 2^55621670 is an apocalyptic number.

55621670 is a deficient number, since it is larger than the sum of its proper divisors (52199050).

55621670 is a wasteful number, since it uses less digits than its factorization.

55621670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427879.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 55621670 is about 7457.9936980397. The cubic root of 55621670 is about 381.7227184723.

The spelling of 55621670 in words is "fifty-five million, six hundred twenty-one thousand, six hundred seventy".