51278940 has 48 divisors (see below), whose sum is σ = 159536160. Its totient is φ = 13674240.

The previous prime is 51278939. The next prime is 51278971. The reversal of 51278940 is 4987215.

51278940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 51278895 and 51278904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46941 + ... + 48020.

It is an arithmetic number, because the mean of its divisors is an integer number (3323670).

Almost surely, 2^51278940 is an apocalyptic number.

It is an amenable number.

51278940 is an abundant number, since it is smaller than the sum of its proper divisors (108257220).

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

51278940 is a wasteful number, since it uses less digits than its factorization.

51278940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94979 (or 94971 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 51278940 is about 7160.9315036523. The cubic root of 51278940 is about 371.5178456866.

The spelling of 51278940 in words is "fifty-one million, two hundred seventy-eight thousand, nine hundred forty".