55881985 has 8 divisors (see below), whose sum is σ = 69370920. Its totient is φ = 43163904.

The previous prime is 55881979. The next prime is 55881997. The reversal of 55881985 is 58918855.

It can be written as a sum of positive squares in 4 ways, for example, as 394384 + 55487601 = 628^2 + 7449^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55881985 - 2¹¹ = 55879937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192552 + ... + 192841.

It is an arithmetic number, because the mean of its divisors is an integer number (8671365).

Almost surely, 2^55881985 is an apocalyptic number.

It is an amenable number.

55881985 is a deficient number, since it is larger than the sum of its proper divisors (13488935).

55881985 is a wasteful number, since it uses less digits than its factorization.

55881985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385427.

The product of its digits is 576000, while the sum is 49.

The square root of 55881985 is about 7475.4254059552. The cubic root of 55881985 is about 382.3172920957.

The spelling of 55881985 in words is "fifty-five million, eight hundred eighty-one thousand, nine hundred eighty-five".