51768637 has 4 divisors (see below), whose sum is σ = 52086400. Its totient is φ = 51450876.

The previous prime is 51768617. The next prime is 51768643. The reversal of 51768637 is 73686715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51768637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51768593 and 51768602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51768617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158637 + ... + 158962.

It is an arithmetic number, because the mean of its divisors is an integer number (13021600).

Almost surely, 2^51768637 is an apocalyptic number.

It is an amenable number.

51768637 is a deficient number, since it is larger than the sum of its proper divisors (317763).

51768637 is a wasteful number, since it uses less digits than its factorization.

51768637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317762.

The product of its digits is 211680, while the sum is 43.

The square root of 51768637 is about 7195.0425294087. The cubic root of 51768637 is about 372.6967253587.

The spelling of 51768637 in words is "fifty-one million, seven hundred sixty-eight thousand, six hundred thirty-seven".