55731638 has 8 divisors (see below), whose sum is σ = 83636280. Its totient is φ = 27852880.

The previous prime is 55731623. The next prime is 55731647. The reversal of 55731638 is 83613755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 353 + ... + 10563.

It is an arithmetic number, because the mean of its divisors is an integer number (10454535).

Almost surely, 2^55731638 is an apocalyptic number.

55731638 is a deficient number, since it is larger than the sum of its proper divisors (27904642).

55731638 is a wasteful number, since it uses less digits than its factorization.

55731638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12942.

The product of its digits is 75600, while the sum is 38.

The square root of 55731638 is about 7465.3625498029. The cubic root of 55731638 is about 381.9741171941.

The spelling of 55731638 in words is "fifty-five million, seven hundred thirty-one thousand, six hundred thirty-eight".