51720652 has 12 divisors (see below), whose sum is σ = 94446576. Its totient is φ = 24735920.

The previous prime is 51720637. The next prime is 51720673. The reversal of 51720652 is 25602715.

It is a self number, because there is not a number n which added to its sum of digits gives 51720652.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280999 + ... + 281182.

It is an arithmetic number, because the mean of its divisors is an integer number (7870548).

Almost surely, 2^51720652 is an apocalyptic number.

It is an amenable number.

51720652 is a deficient number, since it is larger than the sum of its proper divisors (42725924).

51720652 is a wasteful number, since it uses less digits than its factorization.

51720652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562208 (or 562206 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 51720652 is about 7191.7071686770. The cubic root of 51720652 is about 372.5815373360.

The spelling of 51720652 in words is "fifty-one million, seven hundred twenty thousand, six hundred fifty-two".