55505587 has 4 divisors (see below), whose sum is σ = 57005776. Its totient is φ = 54005400.

The previous prime is 55505581. The next prime is 55505591. The reversal of 55505587 is 78550555.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55505587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55505581) 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, 750039 + ... + 750112.

It is an arithmetic number, because the mean of its divisors is an integer number (14251444).

Almost surely, 2^55505587 is an apocalyptic number.

55505587 is a deficient number, since it is larger than the sum of its proper divisors (1500189).

55505587 is a wasteful number, since it uses less digits than its factorization.

55505587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500188.

The product of its (nonzero) digits is 175000, while the sum is 40.

The square root of 55505587 is about 7450.2071783273. The cubic root of 55505587 is about 381.4569804346.

The spelling of 55505587 in words is "fifty-five million, five hundred five thousand, five hundred eighty-seven".