821878008 has 64 divisors (see below), whose sum is σ = 2352706560. Its totient is φ = 234374016.

The previous prime is 821878007. The next prime is 821878027. The reversal of 821878008 is 800878128.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821878007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89185 + ... + 97967.

It is an arithmetic number, because the mean of its divisors is an integer number (36761040).

Almost surely, 2^821878008 is an apocalyptic number.

It is an amenable number.

821878008 is an abundant number, since it is smaller than the sum of its proper divisors (1530828552).

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

821878008 is a wasteful number, since it uses less digits than its factorization.

821878008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9356 (or 9352 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 821878008 is about 28668.4148149143. The cubic root of 821878008 is about 936.7041691368.

The spelling of 821878008 in words is "eight hundred twenty-one million, eight hundred seventy-eight thousand, eight".