55885978 has 4 divisors (see below), whose sum is σ = 83828970. Its totient is φ = 27942988.

The previous prime is 55885967. The next prime is 55885979. The reversal of 55885978 is 87958855.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 34845409 + 21040569 = 5903^2 + 4587^2 .

It is not an unprimeable number, because it can be changed into a prime (55885979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13971493 + ... + 13971496.

Almost surely, 2^55885978 is an apocalyptic number.

55885978 is a deficient number, since it is larger than the sum of its proper divisors (27942992).

55885978 is a wasteful number, since it uses less digits than its factorization.

55885978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27942991.

The product of its digits is 4032000, while the sum is 55.

The square root of 55885978 is about 7475.6924762861. The cubic root of 55885978 is about 382.3263979318.

The spelling of 55885978 in words is "fifty-five million, eight hundred eighty-five thousand, nine hundred seventy-eight".