55638587 has 4 divisors (see below), whose sum is σ = 58057680. Its totient is φ = 53219496.

The previous prime is 55638563. The next prime is 55638589. The reversal of 55638587 is 78583655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55638587 - 2¹⁰ = 55637563 is a prime.

It is a super-4 number, since 4×55638587⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55638589) 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, 1209512 + ... + 1209557.

It is an arithmetic number, because the mean of its divisors is an integer number (14514420).

Almost surely, 2^55638587 is an apocalyptic number.

55638587 is a deficient number, since it is larger than the sum of its proper divisors (2419093).

55638587 is a wasteful number, since it uses less digits than its factorization.

55638587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419092.

The product of its digits is 1008000, while the sum is 47.

The square root of 55638587 is about 7459.1277640217. The cubic root of 55638587 is about 381.7614141141.

The spelling of 55638587 in words is "fifty-five million, six hundred thirty-eight thousand, five hundred eighty-seven".