51378656 has 96 divisors (see below), whose sum is σ = 122572800. Its totient is φ = 21168000.

The previous prime is 51378623. The next prime is 51378659. The reversal of 51378656 is 65687315.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51378659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340181 + ... + 340331.

It is an arithmetic number, because the mean of its divisors is an integer number (1276800).

Almost surely, 2^51378656 is an apocalyptic number.

51378656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51378656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61286400).

51378656 is an abundant number, since it is smaller than the sum of its proper divisors (71194144).

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

51378656 is a wasteful number, since it uses less digits than its factorization.

51378656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 191 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 51378656 is about 7167.8906241655. The cubic root of 51378656 is about 371.7585051481.

The spelling of 51378656 in words is "fifty-one million, three hundred seventy-eight thousand, six hundred fifty-six".