55783866 has 8 divisors (see below), whose sum is σ = 111567744. Its totient is φ = 18594620.

The previous prime is 55783859. The next prime is 55783883. The reversal of 55783866 is 66838755.

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

55783866 is an admirable number.

It is a super-2 number, since 2×55783866² = 6223679411811912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4648650 + ... + 4648661.

It is an arithmetic number, because the mean of its divisors is an integer number (13945968).

Almost surely, 2^55783866 is an apocalyptic number.

55783866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55783866 is a wasteful number, since it uses less digits than its factorization.

55783866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9297316.

The product of its digits is 1209600, while the sum is 48.

The square root of 55783866 is about 7468.8597523317. The cubic root of 55783866 is about 382.0934002219.

The spelling of 55783866 in words is "fifty-five million, seven hundred eighty-three thousand, eight hundred sixty-six".