51378912 has 72 divisors (see below), whose sum is σ = 157359384. Its totient is φ = 15807744.

The previous prime is 51378881. The next prime is 51378919. The reversal of 51378912 is 21987315.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51378919) 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, 3118 + ... + 10605.

It is an arithmetic number, because the mean of its divisors is an integer number (2185547).

Almost surely, 2^51378912 is an apocalyptic number.

51378912 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51378912 is an abundant number, since it is smaller than the sum of its proper divisors (105980472).

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

51378912 is a wasteful number, since it uses less digits than its factorization.

51378912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13752 (or 13741 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 51378912 is about 7167.9084815586. The cubic root of 51378912 is about 371.7591225901.

The spelling of 51378912 in words is "fifty-one million, three hundred seventy-eight thousand, nine hundred twelve".