66288810 has 64 divisors (see below), whose sum is σ = 182476800. Its totient is φ = 15097152.

The previous prime is 66288787. The next prime is 66288857. The reversal of 66288810 is 1888266.

It is a super-2 number, since 2×66288810² = 8788412662432200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100261 + ... + 100919.

It is an arithmetic number, because the mean of its divisors is an integer number (2851200).

Almost surely, 2^66288810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66288810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91238400).

66288810 is an abundant number, since it is smaller than the sum of its proper divisors (116187990).

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

66288810 is a wasteful number, since it uses less digits than its factorization.

66288810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 66288810 is about 8141.7940283453. The cubic root of 66288810 is about 404.7126142889.

The spelling of 66288810 in words is "sixty-six million, two hundred eighty-eight thousand, eight hundred ten".