55778013 has 24 divisors (see below), whose sum is σ = 84397248. Its totient is φ = 35430912.

The previous prime is 55777993. The next prime is 55778027. The reversal of 55778013 is 31087755.

55778013 is a `hidden beast` number, since 5 + 577 + 80 + 1 + 3 = 666.

It is not a de Polignac number, because 55778013 - 2⁶ = 55777949 is a prime.

It is a super-2 number, since 2×55778013² = 6222373468456338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96381 + ... + 96957.

It is an arithmetic number, because the mean of its divisors is an integer number (3516552).

Almost surely, 2^55778013 is an apocalyptic number.

It is an amenable number.

55778013 is a deficient number, since it is larger than the sum of its proper divisors (28619235).

55778013 is a wasteful number, since it uses less digits than its factorization.

55778013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 55778013 is about 7468.4679151751. The cubic root of 55778013 is about 382.0800363167.

The spelling of 55778013 in words is "fifty-five million, seven hundred seventy-eight thousand, thirteen".