820544880 has 40 divisors (see below), whose sum is σ = 2543689872. Its totient is φ = 218811904.

The previous prime is 820544873. The next prime is 820544891. The reversal of 820544880 is 88445028.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1709229 + ... + 1709708.

Almost surely, 2^820544880 is an apocalyptic number.

820544880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

820544880 is an abundant number, since it is smaller than the sum of its proper divisors (1723144992).

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

820544880 is a wasteful number, since it uses less digits than its factorization.

820544880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418953 (or 3418947 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 39.

The square root of 820544880 is about 28645.1545640794. The cubic root of 820544880 is about 936.1974344271.

The spelling of 820544880 in words is "eight hundred twenty million, five hundred forty-four thousand, eight hundred eighty".