55778427 has 12 divisors (see below), whose sum is σ = 84072144. Its totient is φ = 35568720.

The previous prime is 55778417. The next prime is 55778449. The reversal of 55778427 is 72487755.

55778427 is a `hidden beast` number, since 557 + 78 + 4 + 27 = 666.

It is not a de Polignac number, because 55778427 - 2⁶ = 55778363 is a prime.

It is a super-2 number, since 2×55778427² = 6222465837188658, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55778417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134524 + ... + 134937.

It is an arithmetic number, because the mean of its divisors is an integer number (7006012).

Almost surely, 2^55778427 is an apocalyptic number.

55778427 is a deficient number, since it is larger than the sum of its proper divisors (28293717).

55778427 is a wasteful number, since it uses less digits than its factorization.

55778427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269490 (or 269487 counting only the distinct ones).

The product of its digits is 548800, while the sum is 45.

The square root of 55778427 is about 7468.4956316517. The cubic root of 55778427 is about 382.0809816159.

The spelling of 55778427 in words is "fifty-five million, seven hundred seventy-eight thousand, four hundred twenty-seven".