51645852 has 18 divisors (see below), whose sum is σ = 130549328. Its totient is φ = 17215272.

The previous prime is 51645851. The next prime is 51645877. The reversal of 51645852 is 25854615.

51645852 is a `hidden beast` number, since 5 + 1 + 645 + 8 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1434607 = 51645852 / (5 + 1 + 6 + 4 + 5 + 8 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645851) 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 5 ways as a sum of consecutive naturals, for example, 717268 + ... + 717339.

Almost surely, 2^51645852 is an apocalyptic number.

It is an amenable number.

51645852 is an abundant number, since it is smaller than the sum of its proper divisors (78903476).

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

51645852 is a wasteful number, since it uses less digits than its factorization.

51645852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434617 (or 1434612 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 51645852 is about 7186.5048528475. The cubic root of 51645852 is about 372.4018377140.

The spelling of 51645852 in words is "fifty-one million, six hundred forty-five thousand, eight hundred fifty-two".