51447340 has 48 divisors (see below), whose sum is σ = 124891200. Its totient is φ = 17436672.

The previous prime is 51447337. The next prime is 51447349. The reversal of 51447340 is 4374415.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 51447299 and 51447308.

It is not an unprimeable number, because it can be changed into a prime (51447349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10396 + ... + 14524.

It is an arithmetic number, because the mean of its divisors is an integer number (2601900).

Almost surely, 2^51447340 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 51447340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62445600).

51447340 is an abundant number, since it is smaller than the sum of its proper divisors (73443860).

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

51447340 is a wasteful number, since it uses less digits than its factorization.

51447340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4234 (or 4232 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 51447340 is about 7172.6801127612. The cubic root of 51447340 is about 371.9240894168.

The spelling of 51447340 in words is "fifty-one million, four hundred forty-seven thousand, three hundred forty".