8649990 has 80 divisors (see below), whose sum is σ = 23783760. Its totient is φ = 2255040.

The previous prime is 8649973. The next prime is 8650003. The reversal of 8649990 is 999468.

8649990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47700 + ... + 47880.

It is an arithmetic number, because the mean of its divisors is an integer number (297297).

Almost surely, 2^8649990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8649990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11891880).

8649990 is an abundant number, since it is smaller than the sum of its proper divisors (15133770).

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

8649990 is a wasteful number, since it uses less digits than its factorization.

8649990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 8649990 is about 2941.0865339191. The cubic root of 8649990 is about 205.2761695271.

The spelling of 8649990 in words is "eight million, six hundred forty-nine thousand, nine hundred ninety".