51204636 has 120 divisors (see below), whose sum is σ = 155143296. Its totient is φ = 14424480.

The previous prime is 51204631. The next prime is 51204649. The reversal of 51204636 is 63640215.

51204636 is a `hidden beast` number, since 5 + 1 + 20 + 4 + 636 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51204631) 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 39 ways as a sum of consecutive naturals, for example, 242571 + ... + 242781.

Almost surely, 2^51204636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51204636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77571648).

51204636 is an abundant number, since it is smaller than the sum of its proper divisors (103938660).

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

51204636 is a wasteful number, since it uses less digits than its factorization.

51204636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 51204636 is about 7155.7414710147. The cubic root of 51204636 is about 371.3383138538.

The spelling of 51204636 in words is "fifty-one million, two hundred four thousand, six hundred thirty-six".