51278040 has 192 divisors, whose sum is σ = 190045440. Its totient is φ = 11869440.

The previous prime is 51278039. The next prime is 51278053. The reversal of 51278040 is 4087215.

It is a junction number, because it is equal to n+sod(n) for n = 51277995 and 51278013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90799 + ... + 91361.

It is an arithmetic number, because the mean of its divisors is an integer number (989820).

Almost surely, 2^51278040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51278040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95022720).

51278040 is an abundant number, since it is smaller than the sum of its proper divisors (138767400).

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

51278040 is a wasteful number, since it uses less digits than its factorization.

51278040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 51278040 is about 7160.8686623901. The cubic root of 51278040 is about 371.5156721626.

The spelling of 51278040 in words is "fifty-one million, two hundred seventy-eight thousand, forty".