55687893 has 4 divisors (see below), whose sum is σ = 74250528. Its totient is φ = 37125260.

The previous prime is 55687889. The next prime is 55687909. The reversal of 55687893 is 39878655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55687893 - 2² = 55687889 is a prime.

It is a super-2 number, since 2×55687893² = 6202282853558898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55687843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9281313 + ... + 9281318.

It is an arithmetic number, because the mean of its divisors is an integer number (18562632).

Almost surely, 2^55687893 is an apocalyptic number.

It is an amenable number.

55687893 is a deficient number, since it is larger than the sum of its proper divisors (18562635).

55687893 is a wasteful number, since it uses less digits than its factorization.

55687893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18562634.

The product of its digits is 1814400, while the sum is 51.

The square root of 55687893 is about 7462.4321102440. The cubic root of 55687893 is about 381.8741510460.

The spelling of 55687893 in words is "fifty-five million, six hundred eighty-seven thousand, eight hundred ninety-three".