865940080 has 20 divisors (see below), whose sum is σ = 2013310872. Its totient is φ = 346376000.

The previous prime is 865940077. The next prime is 865940083. The reversal of 865940080 is 80049568.

865940080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (865940077) and next prime (865940083).

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865940083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5412046 + ... + 5412205.

Almost surely, 2^865940080 is an apocalyptic number.

865940080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865940080 is an abundant number, since it is smaller than the sum of its proper divisors (1147370792).

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

865940080 is a wasteful number, since it uses less digits than its factorization.

865940080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10824264 (or 10824258 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 865940080 is about 29426.8598392693. The cubic root of 865940080 is about 953.1529883101.

The spelling of 865940080 in words is "eight hundred sixty-five million, nine hundred forty thousand, eighty".