51745660 has 24 divisors (see below), whose sum is σ = 108828720. Its totient is φ = 20667264.

The previous prime is 51745643. The next prime is 51745663. The reversal of 51745660 is 6654715.

It is a happy number.

It is a super-2 number, since 2×51745660² = 5355226657671200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51745663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15631 + ... + 18649.

It is an arithmetic number, because the mean of its divisors is an integer number (4534530).

Almost surely, 2^51745660 is an apocalyptic number.

It is an amenable number.

51745660 is an abundant number, since it is smaller than the sum of its proper divisors (57083060).

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

51745660 is a wasteful number, since it uses less digits than its factorization.

51745660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885 (or 3883 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 51745660 is about 7193.4456277920. The cubic root of 51745660 is about 372.6415779413.

The spelling of 51745660 in words is "fifty-one million, seven hundred forty-five thousand, six hundred sixty".