51266664 has 96 divisors (see below), whose sum is σ = 147232800. Its totient is φ = 16087680.

The previous prime is 51266651. The next prime is 51266669. The reversal of 51266664 is 46666215.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (51840) is a multiple of the sum of its prime divisors (648).

It is not an unprimeable number, because it can be changed into a prime (51266669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89499 + ... + 90069.

It is an arithmetic number, because the mean of its divisors is an integer number (1533675).

Almost surely, 2^51266664 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 51266664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73616400).

51266664 is an abundant number, since it is smaller than the sum of its proper divisors (95966136).

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

51266664 is a wasteful number, since it uses less digits than its factorization.

51266664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 648 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 51266664 is about 7160.0743012905. The cubic root of 51266664 is about 371.4881966268.

It can be divided in two parts, 512 and 66664, that added together give a palindrome (67176).

The spelling of 51266664 in words is "fifty-one million, two hundred sixty-six thousand, six hundred sixty-four".