51547840 has 28 divisors (see below), whose sum is σ = 122749056. Its totient is φ = 20619008.

The previous prime is 51547813. The next prime is 51547871. The reversal of 51547840 is 4874515.

It is a junction number, because it is equal to n+sod(n) for n = 51547796 and 51547805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80224 + ... + 80863.

Almost surely, 2^51547840 is an apocalyptic number.

It is an amenable number.

51547840 is an abundant number, since it is smaller than the sum of its proper divisors (71201216).

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

51547840 is a wasteful number, since it uses less digits than its factorization.

51547840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161104 (or 161094 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 51547840 is about 7179.6824442311. The cubic root of 51547840 is about 372.1661107302.

The spelling of 51547840 in words is "fifty-one million, five hundred forty-seven thousand, eight hundred forty".