51947856 has 30 divisors (see below), whose sum is σ = 145382250. Its totient is φ = 17315904.

The previous prime is 51947851. The next prime is 51947873. The reversal of 51947856 is 65874915.

It can be written as a sum of positive squares in only one way, i.e., 50979600 + 968256 = 7140^2 + 984^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51947851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 180231 + ... + 180518.

It is an arithmetic number, because the mean of its divisors is an integer number (4846075).

Almost surely, 2^51947856 is an apocalyptic number.

It is an amenable number.

51947856 is an abundant number, since it is smaller than the sum of its proper divisors (93434394).

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

51947856 is a wasteful number, since it uses less digits than its factorization.

51947856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360763 (or 360754 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 51947856 is about 7207.4861082072. The cubic root of 51947856 is about 373.1263123781.

The spelling of 51947856 in words is "fifty-one million, nine hundred forty-seven thousand, eight hundred fifty-six".