51767240 has 64 divisors (see below), whose sum is σ = 133781760. Its totient is φ = 17660160.

The previous prime is 51767203. The next prime is 51767321. The reversal of 51767240 is 4276715.

It is a junction number, because it is equal to n+sod(n) for n = 51767197 and 51767206.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81725 + ... + 82355.

It is an arithmetic number, because the mean of its divisors is an integer number (2090340).

Almost surely, 2^51767240 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 51767240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66890880).

51767240 is an abundant number, since it is smaller than the sum of its proper divisors (82014520).

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

51767240 is a wasteful number, since it uses less digits than its factorization.

51767240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 51767240 is about 7194.9454480211. The cubic root of 51767240 is about 372.6933728655.

The spelling of 51767240 in words is "fifty-one million, seven hundred sixty-seven thousand, two hundred forty".