51856002 has 72 divisors (see below), whose sum is σ = 127911420. Its totient is φ = 15153600.

The previous prime is 51855989. The next prime is 51856033. The reversal of 51856002 is 20065815.

51856002 is a `hidden beast` number, since 51 + 8 + 5 + 600 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51279921 + 576081 = 7161^2 + 759^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62752 + ... + 63572.

Almost surely, 2^51856002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51856002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63955710).

51856002 is an abundant number, since it is smaller than the sum of its proper divisors (76055418).

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

51856002 is a wasteful number, since it uses less digits than its factorization.

51856002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 51856002 is about 7201.1111642579. Note that the first 4 decimals coincide. The cubic root of 51856002 is about 372.9062624578.

The spelling of 51856002 in words is "fifty-one million, eight hundred fifty-six thousand, two".