55817678 has 8 divisors (see below), whose sum is σ = 95687472. Its totient is φ = 23921856.

The previous prime is 55817669. The next prime is 55817683. The reversal of 55817678 is 87671855.

It is a happy number.

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

It is a super-2 number, since 2×55817678² = 6231226354623368, which contains 22 as substring.

It is a congruent number.

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, 1993475 + ... + 1993502.

It is an arithmetic number, because the mean of its divisors is an integer number (11960934).

Almost surely, 2^55817678 is an apocalyptic number.

55817678 is a deficient number, since it is larger than the sum of its proper divisors (39869794).

55817678 is a wasteful number, since it uses less digits than its factorization.

55817678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986986.

The product of its digits is 470400, while the sum is 47.

The square root of 55817678 is about 7471.1229410310. The cubic root of 55817678 is about 382.1705834268.

The spelling of 55817678 in words is "fifty-five million, eight hundred seventeen thousand, six hundred seventy-eight".