51388878 has 8 divisors (see below), whose sum is σ = 102777768. Its totient is φ = 17129624.

The previous prime is 51388817. The next prime is 51388879. The reversal of 51388878 is 87888315.

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

51388878 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4282401 + ... + 4282412.

It is an arithmetic number, because the mean of its divisors is an integer number (12847221).

Almost surely, 2^51388878 is an apocalyptic number.

51388878 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.

51388878 is a wasteful number, since it uses less digits than its factorization.

51388878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8564818.

The product of its digits is 430080, while the sum is 48.

The square root of 51388878 is about 7168.6036297176. The cubic root of 51388878 is about 371.7831578200.

The spelling of 51388878 in words is "fifty-one million, three hundred eighty-eight thousand, eight hundred seventy-eight".