51701664 has 144 divisors (see below), whose sum is σ = 163749600. Its totient is φ = 14224896.

The previous prime is 51701647. The next prime is 51701669. The reversal of 51701664 is 46610715.

It is not an unprimeable number, because it can be changed into a prime (51701669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136227 + ... + 136605.

It is an arithmetic number, because the mean of its divisors is an integer number (1137150).

Almost surely, 2^51701664 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 51701664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81874800).

51701664 is an abundant number, since it is smaller than the sum of its proper divisors (112047936).

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

51701664 is a wasteful number, since it uses less digits than its factorization.

51701664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 51701664 is about 7190.3869158759. The cubic root of 51701664 is about 372.5359369560.

The spelling of 51701664 in words is "fifty-one million, seven hundred one thousand, six hundred sixty-four".