867581329920 has 80 divisors (see below), whose sum is σ = 2773549088640. Its totient is φ = 231355019264.

The previous prime is 867581329913. The next prime is 867581329981. The reversal of 867581329920 is 29923185768.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

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 7 ways as a sum of consecutive naturals, for example, 56475480 + ... + 56490839.

It is an arithmetic number, because the mean of its divisors is an integer number (34669363608).

Almost surely, 2^867581329920 is an apocalyptic number.

867581329920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

867581329920 is an abundant number, since it is smaller than the sum of its proper divisors (1905967758720).

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

867581329920 is a wasteful number, since it uses less digits than its factorization.

867581329920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112966345 (or 112966329 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 867581329920 in words is "eight hundred sixty-seven billion, five hundred eighty-one million, three hundred twenty-nine thousand, nine hundred twenty".