51185478 has 8 divisors (see below), whose sum is σ = 102370968. Its totient is φ = 17061824.

The previous prime is 51185441. The next prime is 51185479. The reversal of 51185478 is 87458115.

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

51185478 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51185479) 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 3 ways as a sum of consecutive naturals, for example, 4265451 + ... + 4265462.

It is an arithmetic number, because the mean of its divisors is an integer number (12796371).

Almost surely, 2^51185478 is an apocalyptic number.

51185478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51185478 is a wasteful number, since it uses less digits than its factorization.

51185478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8530918.

The product of its digits is 44800, while the sum is 39.

The square root of 51185478 is about 7154.4027004356. The cubic root of 51185478 is about 371.2919965188.

The spelling of 51185478 in words is "fifty-one million, one hundred eighty-five thousand, four hundred seventy-eight".