51600640 has 144 divisors (see below), whose sum is σ = 152466048. Its totient is φ = 16293888.

The previous prime is 51600629. The next prime is 51600649. The reversal of 51600640 is 4600615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51600649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116259 + ... + 116701.

It is an arithmetic number, because the mean of its divisors is an integer number (1058792).

Almost surely, 2^51600640 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 51600640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76233024).

51600640 is an abundant number, since it is smaller than the sum of its proper divisors (100865408).

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

51600640 is a wasteful number, since it uses less digits than its factorization.

51600640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 51600640 is about 7183.3585459728. The cubic root of 51600640 is about 372.2931361965.

The spelling of 51600640 in words is "fifty-one million, six hundred thousand, six hundred forty".