51361740 has 36 divisors (see below), whose sum is σ = 155797824. Its totient is φ = 13696416.

The previous prime is 51361703. The next prime is 51361747. The reversal of 51361740 is 4716315.

51361740 is a `hidden beast` number, since 5 + 1 + 3 + 617 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (51361747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142492 + ... + 142851.

Almost surely, 2^51361740 is an apocalyptic number.

It is an amenable number.

51361740 is an abundant number, since it is smaller than the sum of its proper divisors (104436084).

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

51361740 is a wasteful number, since it uses less digits than its factorization.

51361740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285358 (or 285353 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 51361740 is about 7166.7105425014. The cubic root of 51361740 is about 371.7177011927.

The spelling of 51361740 in words is "fifty-one million, three hundred sixty-one thousand, seven hundred forty".