51711660 has 432 divisors, whose sum is σ = 219596832. Its totient is φ = 9676800.

The previous prime is 51711641. The next prime is 51711661. The reversal of 51711660 is 6611715.

It is not an unprimeable number, because it can be changed into a prime (51711661) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1261240 + ... + 1261280.

It is an arithmetic number, because the mean of its divisors is an integer number (508326).

Almost surely, 2^51711660 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 51711660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109798416).

51711660 is an abundant number, since it is smaller than the sum of its proper divisors (167885172).

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

51711660 is a wasteful number, since it uses less digits than its factorization.

51711660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 51711660 is about 7191.0819770046. The cubic root of 51711660 is about 372.5599441089.

51711660 divided by its product of nonzero digits (1260) gives a triangular number (41041 = T₂₈₆).

The spelling of 51711660 in words is "fifty-one million, seven hundred eleven thousand, six hundred sixty".