866880990 has 48 divisors (see below), whose sum is σ = 2255526000. Its totient is φ = 231000576.

The previous prime is 866880901. The next prime is 866880991. The reversal of 866880990 is 99088668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866880991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167461 + ... + 172559.

It is an arithmetic number, because the mean of its divisors is an integer number (46990125).

Almost surely, 2^866880990 is an apocalyptic number.

866880990 is an abundant number, since it is smaller than the sum of its proper divisors (1388645010).

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

866880990 is a wasteful number, since it uses less digits than its factorization.

866880990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001 (or 6998 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 866880990 is about 29442.8427635648. The cubic root of 866880990 is about 953.4980878421.

The spelling of 866880990 in words is "eight hundred sixty-six million, eight hundred eighty thousand, nine hundred ninety".