51255040 has 72 divisors (see below), whose sum is σ = 128183328. Its totient is φ = 19599360.

The previous prime is 51255031. The next prime is 51255047. The reversal of 51255040 is 4055215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51255047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28570 + ... + 30310.

It is an arithmetic number, because the mean of its divisors is an integer number (1780324).

Almost surely, 2^51255040 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 51255040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64091664).

51255040 is an abundant number, since it is smaller than the sum of its proper divisors (76928288).

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

51255040 is a wasteful number, since it uses less digits than its factorization.

51255040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785 (or 1771 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51255040 is about 7159.2625318534. The cubic root of 51255040 is about 371.4601179179.

The spelling of 51255040 in words is "fifty-one million, two hundred fifty-five thousand, forty".