55705587 has 32 divisors (see below), whose sum is σ = 90048000. Its totient is φ = 29922048.

The previous prime is 55705579. The next prime is 55705589. The reversal of 55705587 is 78550755.

It is a happy number.

It is not a de Polignac number, because 55705587 - 2³ = 55705579 is a prime.

It is a super-2 number, since 2×55705587² = 6206224846029138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55705589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58983 + ... + 59919.

It is an arithmetic number, because the mean of its divisors is an integer number (2814000).

Almost surely, 2^55705587 is an apocalyptic number.

55705587 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

55705587 is a deficient number, since it is larger than the sum of its proper divisors (34342413).

55705587 is a wasteful number, since it uses less digits than its factorization.

55705587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115.

The product of its (nonzero) digits is 245000, while the sum is 42.

The square root of 55705587 is about 7463.6175545107. The cubic root of 55705587 is about 381.9145917076.

The spelling of 55705587 in words is "fifty-five million, seven hundred five thousand, five hundred eighty-seven".