55617678 has 40 divisors (see below), whose sum is σ = 126358848. Its totient is φ = 18281376.

The previous prime is 55617671. The next prime is 55617691. The reversal of 55617678 is 87671655.

It is a super-2 number, since 2×55617678² = 6186652212223368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55617671) 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 in 19 ways as a sum of consecutive naturals, for example, 9475 + ... + 14177.

Almost surely, 2^55617678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55617678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63179424).

55617678 is an abundant number, since it is smaller than the sum of its proper divisors (70741170).

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

55617678 is a wasteful number, since it uses less digits than its factorization.

55617678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790 (or 4781 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 55617678 is about 7457.7260609384. The cubic root of 55617678 is about 381.7135860991.

The spelling of 55617678 in words is "fifty-five million, six hundred seventeen thousand, six hundred seventy-eight".