66499290 has 96 divisors (see below), whose sum is σ = 203164416. Its totient is φ = 14878080.

The previous prime is 66499271. The next prime is 66499319. The reversal of 66499290 is 9299466.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 47 ways as a sum of consecutive naturals, for example, 10287 + ... + 15453.

It is an arithmetic number, because the mean of its divisors is an integer number (2116296).

Almost surely, 2^66499290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66499290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101582208).

66499290 is an abundant number, since it is smaller than the sum of its proper divisors (136665126).

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

66499290 is a wasteful number, since it uses less digits than its factorization.

66499290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204 (or 5201 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 66499290 is about 8154.7096821407. The cubic root of 66499290 is about 405.1405090885.

The spelling of 66499290 in words is "sixty-six million, four hundred ninety-nine thousand, two hundred ninety".