55247778 has 16 divisors (see below), whose sum is σ = 122772960. Its totient is φ = 18415908.

The previous prime is 55247767. The next prime is 55247789. The reversal of 55247778 is 87774255.

It is an interprime number because it is at equal distance from previous prime (55247767) and next prime (55247789).

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 511500 + ... + 511607.

It is an arithmetic number, because the mean of its divisors is an integer number (7673310).

Almost surely, 2^55247778 is an apocalyptic number.

55247778 is an abundant number, since it is smaller than the sum of its proper divisors (67525182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55247778 is a wasteful number, since it uses less digits than its factorization.

55247778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023118 (or 1023112 counting only the distinct ones).

The product of its digits is 548800, while the sum is 45.

The square root of 55247778 is about 7432.8849042616. The cubic root of 55247778 is about 380.8654742375.

The spelling of 55247778 in words is "fifty-five million, two hundred forty-seven thousand, seven hundred seventy-eight".