51009320936 has 128 divisors (see below), whose sum is σ = 112867776000. Its totient is φ = 21162885120.

The previous prime is 51009320821. The next prime is 51009320941. The reversal of 51009320936 is 63902390015.

It is a self number, because there is not a number n which added to its sum of digits gives 51009320936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85157165 + ... + 85157763.

It is an arithmetic number, because the mean of its divisors is an integer number (881779500).

Almost surely, 2^51009320936 is an apocalyptic number.

51009320936 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51009320936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56433888000).

51009320936 is an abundant number, since it is smaller than the sum of its proper divisors (61858455064).

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

51009320936 is a wasteful number, since it uses less digits than its factorization.

51009320936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 38.

The spelling of 51009320936 in words is "fifty-one billion, nine million, three hundred twenty thousand, nine hundred thirty-six".