51447540 has 24 divisors (see below), whose sum is σ = 144053280. Its totient is φ = 13719328.

The previous prime is 51447533. The next prime is 51447541. The reversal of 51447540 is 4574415.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51447498 and 51447507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51447541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428670 + ... + 428789.

It is an arithmetic number, because the mean of its divisors is an integer number (6002220).

Almost surely, 2^51447540 is an apocalyptic number.

It is an amenable number.

51447540 is an abundant number, since it is smaller than the sum of its proper divisors (92605740).

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

51447540 is a wasteful number, since it uses less digits than its factorization.

51447540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857471 (or 857469 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 51447540 is about 7172.6940545377. The cubic root of 51447540 is about 371.9245713642.

The spelling of 51447540 in words is "fifty-one million, four hundred forty-seven thousand, five hundred forty".