55786478 has 16 divisors (see below), whose sum is σ = 92651904. Its totient is φ = 24978360.

The previous prime is 55786463. The next prime is 55786487. The reversal of 55786478 is 87468755.

It is a super-2 number, since 2×55786478² = 6224262255288968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17450 + ... + 20397.

It is an arithmetic number, because the mean of its divisors is an integer number (5790744).

Almost surely, 2^55786478 is an apocalyptic number.

55786478 is a deficient number, since it is larger than the sum of its proper divisors (36865426).

55786478 is a wasteful number, since it uses less digits than its factorization.

55786478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37927.

The product of its digits is 1881600, while the sum is 50.

The square root of 55786478 is about 7469.0346096400. The cubic root of 55786478 is about 382.0993637884.

The spelling of 55786478 in words is "fifty-five million, seven hundred eighty-six thousand, four hundred seventy-eight".