899949666 has 128 divisors (see below), whose sum is σ = 2326579200. Its totient is φ = 225308160.

The previous prime is 899949647. The next prime is 899949667. The reversal of 899949666 is 666949998.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 899949597 and 899949606.

It is not an unprimeable number, because it can be changed into a prime (899949667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1767820 + ... + 1768328.

It is an arithmetic number, because the mean of its divisors is an integer number (18176400).

Almost surely, 2^899949666 is an apocalyptic number.

899949666 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 899949666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163289600).

899949666 is an abundant number, since it is smaller than the sum of its proper divisors (1426629534).

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

899949666 is a wasteful number, since it uses less digits than its factorization.

899949666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its digits is 45349632, while the sum is 66.

The square root of 899949666 is about 29999.1610882705. The cubic root of 899949666 is about 965.4713854024.

The spelling of 899949666 in words is "eight hundred ninety-nine million, nine hundred forty-nine thousand, six hundred sixty-six".