8661390 has 32 divisors (see below), whose sum is σ = 21132576. Its totient is φ = 2271360.

The previous prime is 8661383. The next prime is 8661407. The reversal of 8661390 is 931668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537 + ... + 4196.

It is an arithmetic number, because the mean of its divisors is an integer number (660393).

Almost surely, 2^8661390 is an apocalyptic number.

8661390 is an abundant number, since it is smaller than the sum of its proper divisors (12471186).

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

8661390 is a wasteful number, since it uses less digits than its factorization.

8661390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4804.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 8661390 is about 2943.0239550503. The cubic root of 8661390 is about 205.3663091705.

The spelling of 8661390 in words is "eight million, six hundred sixty-one thousand, three hundred ninety".