55878566 has 4 divisors (see below), whose sum is σ = 83817852. Its totient is φ = 27939282.

The previous prime is 55878539. The next prime is 55878583. The reversal of 55878566 is 66587855.

55878566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13969640 + ... + 13969643.

It is an arithmetic number, because the mean of its divisors is an integer number (20954463).

Almost surely, 2^55878566 is an apocalyptic number.

55878566 is a deficient number, since it is larger than the sum of its proper divisors (27939286).

55878566 is a wasteful number, since it uses less digits than its factorization.

55878566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27939285.

The product of its digits is 2016000, while the sum is 50.

The square root of 55878566 is about 7475.1967198195. The cubic root of 55878566 is about 382.3094948931.

The spelling of 55878566 in words is "fifty-five million, eight hundred seventy-eight thousand, five hundred sixty-six".