866091954 has 96 divisors (see below), whose sum is σ = 2223317376. Its totient is φ = 222808320.

The previous prime is 866091949. The next prime is 866091973. The reversal of 866091954 is 459190668.

It is a Curzon number.

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, 153939 + ... + 159465.

It is an arithmetic number, because the mean of its divisors is an integer number (23159556).

Almost surely, 2^866091954 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866091954, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111658688).

866091954 is an abundant number, since it is smaller than the sum of its proper divisors (1357225422).

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

866091954 is a wasteful number, since it uses less digits than its factorization.

866091954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5600 (or 5593 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 866091954 is about 29429.4402597127. The cubic root of 866091954 is about 953.2087083682.

The spelling of 866091954 in words is "eight hundred sixty-six million, ninety-one thousand, nine hundred fifty-four".