51786036 has 18 divisors (see below), whose sum is σ = 130903682. Its totient is φ = 17262000.

The previous prime is 51786023. The next prime is 51786037. The reversal of 51786036 is 63068715.

It can be written as a sum of positive squares in only one way, i.e., 51753636 + 32400 = 7194^2 + 180^2 .

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: 1438501 = 51786036 / (5 + 1 + 7 + 8 + 6 + 0 + 3 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51786037) 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, 719215 + ... + 719286.

Almost surely, 2^51786036 is an apocalyptic number.

It is an amenable number.

51786036 is an abundant number, since it is smaller than the sum of its proper divisors (79117646).

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

51786036 is a wasteful number, since it uses less digits than its factorization.

51786036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438511 (or 1438506 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 51786036 is about 7196.2515242312. The cubic root of 51786036 is about 372.7384740852.

The spelling of 51786036 in words is "fifty-one million, seven hundred eighty-six thousand, thirty-six".