51516642 has 32 divisors (see below), whose sum is σ = 108028800. Its totient is φ = 16346880.

The previous prime is 51516629. The next prime is 51516643. The reversal of 51516642 is 24661515.

It is not an unprimeable number, because it can be changed into a prime (51516643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32484 + ... + 34032.

It is an arithmetic number, because the mean of its divisors is an integer number (3375900).

Almost surely, 2^51516642 is an apocalyptic number.

51516642 is an abundant number, since it is smaller than the sum of its proper divisors (56512158).

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

51516642 is a wasteful number, since it uses less digits than its factorization.

51516642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818.

The product of its digits is 7200, while the sum is 30.

The square root of 51516642 is about 7177.5094566291. The cubic root of 51516642 is about 372.0910142665.

The spelling of 51516642 in words is "fifty-one million, five hundred sixteen thousand, six hundred forty-two".