868521408 has 28 divisors (see below), whose sum is σ = 2297963400. Its totient is φ = 289507072.

The previous prime is 868521403. The next prime is 868521419. The reversal of 868521408 is 804125868.

It is a self number, because there is not a number n which added to its sum of digits gives 868521408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868521403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2261583 + ... + 2261966.

Almost surely, 2^868521408 is an apocalyptic number.

It is an amenable number.

868521408 is an abundant number, since it is smaller than the sum of its proper divisors (1429441992).

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

868521408 is a wasteful number, since it uses less digits than its factorization.

868521408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523564 (or 4523554 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 868521408 is about 29470.6872671813. The cubic root of 868521408 is about 954.0991506808.

The spelling of 868521408 in words is "eight hundred sixty-eight million, five hundred twenty-one thousand, four hundred eight".