869801980 has 24 divisors (see below), whose sum is σ = 1838225088. Its totient is φ = 345703488.

The previous prime is 869801951. The next prime is 869801987. The reversal of 869801980 is 89108968.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869801987) 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 7 ways as a sum of consecutive naturals, for example, 135364 + ... + 141643.

It is an arithmetic number, because the mean of its divisors is an integer number (76592712).

Almost surely, 2^869801980 is an apocalyptic number.

It is an amenable number.

869801980 is an abundant number, since it is smaller than the sum of its proper divisors (968423108).

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

869801980 is a wasteful number, since it uses less digits than its factorization.

869801980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277173 (or 277171 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 869801980 is about 29492.4054631019. The cubic root of 869801980 is about 954.5678371389.

The spelling of 869801980 in words is "eight hundred sixty-nine million, eight hundred one thousand, nine hundred eighty".