51047040 has 128 divisors (see below), whose sum is σ = 177577920. Its totient is φ = 12369920.

The previous prime is 51047023. The next prime is 51047071. The reversal of 51047040 is 4074015.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 51046998 and 51047016.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19912 + ... + 22328.

Almost surely, 2^51047040 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 51047040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88788960).

51047040 is an abundant number, since it is smaller than the sum of its proper divisors (126530880).

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

51047040 is a wasteful number, since it uses less digits than its factorization.

51047040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450 (or 2438 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 51047040 is about 7144.7211282177. The cubic root of 51047040 is about 370.9569579271.

The spelling of 51047040 in words is "fifty-one million, forty-seven thousand, forty".