51447840 has 48 divisors (see below), whose sum is σ = 162062208. Its totient is φ = 13719296.

The previous prime is 51447829. The next prime is 51447841. The reversal of 51447840 is 4874415.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (51447841) 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, 53112 + ... + 54071.

It is an arithmetic number, because the mean of its divisors is an integer number (3376296).

Almost surely, 2^51447840 is an apocalyptic number.

It is an amenable number.

51447840 is an abundant number, since it is smaller than the sum of its proper divisors (110614368).

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

51447840 is a wasteful number, since it uses less digits than its factorization.

51447840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107201 (or 107193 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 51447840 is about 7172.7149671516. The cubic root of 51447840 is about 371.9252942828.

The spelling of 51447840 in words is "fifty-one million, four hundred forty-seven thousand, eight hundred forty".