55291887 has 24 divisors (see below), whose sum is σ = 91472160. Its totient is φ = 31527360.

The previous prime is 55291867. The next prime is 55291891. The reversal of 55291887 is 78819255.

It is a happy number.

55291887 is a `hidden beast` number, since 552 + 9 + 18 + 87 = 666.

It is not a de Polignac number, because 55291887 - 2⁷ = 55291759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55291807) 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 23 ways as a sum of consecutive naturals, for example, 51189 + ... + 52257.

It is an arithmetic number, because the mean of its divisors is an integer number (3811340).

Almost surely, 2^55291887 is an apocalyptic number.

55291887 is a deficient number, since it is larger than the sum of its proper divisors (36180273).

55291887 is a wasteful number, since it uses less digits than its factorization.

55291887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903 (or 1900 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 55291887 is about 7435.8514643583. The cubic root of 55291887 is about 380.9668063751.

The spelling of 55291887 in words is "fifty-five million, two hundred ninety-one thousand, eight hundred eighty-seven".