866149680 has 160 divisors (see below), whose sum is σ = 2966952960. Its totient is φ = 207267840.

The previous prime is 866149679. The next prime is 866149693. The reversal of 866149680 is 86941668.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206484 + ... + 210636.

It is an arithmetic number, because the mean of its divisors is an integer number (18543456).

Almost surely, 2^866149680 is an apocalyptic number.

866149680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866149680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1483476480).

866149680 is an abundant number, since it is smaller than the sum of its proper divisors (2100803280).

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

866149680 is a wasteful number, since it uses less digits than its factorization.

866149680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 866149680 is about 29430.4209959695. The cubic root of 866149680 is about 953.2298853742.

The spelling of 866149680 in words is "eight hundred sixty-six million, one hundred forty-nine thousand, six hundred eighty".