55731916 has 36 divisors (see below), whose sum is σ = 106487248. Its totient is φ = 25498368.

The previous prime is 55731887. The next prime is 55731917. The reversal of 55731916 is 61913755.

55731916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55731916² = 6212092922062112, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (55731917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42121 + ... + 43423.

Almost surely, 2^55731916 is an apocalyptic number.

It is an amenable number.

55731916 is a deficient number, since it is larger than the sum of its proper divisors (50755332).

55731916 is a wasteful number, since it uses less digits than its factorization.

55731916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 1359 counting only the distinct ones).

The product of its digits is 28350, while the sum is 37.

The square root of 55731916 is about 7465.3811691032. The cubic root of 55731916 is about 381.9747523129.

The spelling of 55731916 in words is "fifty-five million, seven hundred thirty-one thousand, nine hundred sixteen".