51807756220 has 96 divisors (see below), whose sum is σ = 126727856640. Its totient is φ = 17600943360.

The previous prime is 51807756131. The next prime is 51807756223. The reversal of 51807756220 is 2265770815.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51807756223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98526 + ... + 336634.

It is an arithmetic number, because the mean of its divisors is an integer number (1320081840).

Almost surely, 2^51807756220 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 51807756220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63363928320).

51807756220 is an abundant number, since it is smaller than the sum of its proper divisors (74920100420).

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

51807756220 is a wasteful number, since it uses less digits than its factorization.

51807756220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238195 (or 238193 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 51807756220 in words is "fifty-one billion, eight hundred seven million, seven hundred fifty-six thousand, two hundred twenty".