51240632436 has 144 divisors (see below), whose sum is σ = 148953063168. Its totient is φ = 14549068800.

The previous prime is 51240632431. The next prime is 51240632489. The reversal of 51240632436 is 63423604215.

51240632436 is a `hidden beast` number, since 5 + 1 + 2 + 406 + 3 + 243 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51240632436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240632431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32993836 + ... + 32995388.

It is an arithmetic number, because the mean of its divisors is an integer number (1034396272).

Almost surely, 2^51240632436 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 51240632436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74476531584).

51240632436 is an abundant number, since it is smaller than the sum of its proper divisors (97712430732).

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

51240632436 is a wasteful number, since it uses less digits than its factorization.

51240632436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302 (or 2297 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 51240632436 in words is "fifty-one billion, two hundred forty million, six hundred thirty-two thousand, four hundred thirty-six".