51087666 has 16 divisors (see below), whose sum is σ = 116771904. Its totient is φ = 14596464.

The previous prime is 51087661. The next prime is 51087709. The reversal of 51087666 is 66678015.

It is not an unprimeable number, because it can be changed into a prime (51087661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608145 + ... + 608228.

It is an arithmetic number, because the mean of its divisors is an integer number (7298244).

Almost surely, 2^51087666 is an apocalyptic number.

51087666 is an abundant number, since it is smaller than the sum of its proper divisors (65684238).

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

51087666 is a wasteful number, since it uses less digits than its factorization.

51087666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216385.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 51087666 is about 7147.5636408499. The cubic root of 51087666 is about 371.0553410469.

The spelling of 51087666 in words is "fifty-one million, eighty-seven thousand, six hundred sixty-six".