867583640440 has 64 divisors (see below), whose sum is σ = 2129753088000. Its totient is φ = 315450944640.

The previous prime is 867583640431. The next prime is 867583640461. The reversal of 867583640440 is 44046385768.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4174921 + ... + 4377799.

It is an arithmetic number, because the mean of its divisors is an integer number (33277392000).

Almost surely, 2^867583640440 is an apocalyptic number.

It is an amenable number.

867583640440 is an abundant number, since it is smaller than the sum of its proper divisors (1262169447560).

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

867583640440 is a wasteful number, since it uses less digits than its factorization.

867583640440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212620 (or 212616 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 55.

The spelling of 867583640440 in words is "eight hundred sixty-seven billion, five hundred eighty-three million, six hundred forty thousand, four hundred forty".