51066642 has 64 divisors (see below), whose sum is σ = 118448640. Its totient is φ = 14515200.

The previous prime is 51066637. The next prime is 51066667. The reversal of 51066642 is 24666015.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241917 + ... + 242127.

It is an arithmetic number, because the mean of its divisors is an integer number (1850760).

Almost surely, 2^51066642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51066642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59224320).

51066642 is an abundant number, since it is smaller than the sum of its proper divisors (67381998).

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

51066642 is a wasteful number, since it uses less digits than its factorization.

51066642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 51066642 is about 7146.0927785749. The cubic root of 51066642 is about 371.0044341878.

The spelling of 51066642 in words is "fifty-one million, sixty-six thousand, six hundred forty-two".