821880108 has 60 divisors (see below), whose sum is σ = 2455500432. Its totient is φ = 234822240.

The previous prime is 821880053. The next prime is 821880109. The reversal of 821880108 is 801088128.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (821880109) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 178923 + ... + 183458.

Almost surely, 2^821880108 is an apocalyptic number.

It is an amenable number.

821880108 is an abundant number, since it is smaller than the sum of its proper divisors (1633620324).

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

821880108 is a wasteful number, since it uses less digits than its factorization.

821880108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362404 (or 362393 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 821880108 is about 28668.4514405644. The cubic root of 821880108 is about 936.7049669345.

The spelling of 821880108 in words is "eight hundred twenty-one million, eight hundred eighty thousand, one hundred eight".