820885901648 has 40 divisors (see below), whose sum is σ = 1662136027200. Its totient is φ = 392001741824.

The previous prime is 820885901587. The next prime is 820885901651. The reversal of 820885901648 is 846109588028.

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, 1449953 + ... + 1934976.

It is an arithmetic number, because the mean of its divisors is an integer number (41553400680).

Almost surely, 2^820885901648 is an apocalyptic number.

It is an amenable number.

820885901648 is an abundant number, since it is smaller than the sum of its proper divisors (841250125552).

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

820885901648 is a wasteful number, since it uses less digits than its factorization.

820885901648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385619 (or 3385613 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 59.

The spelling of 820885901648 in words is "eight hundred twenty billion, eight hundred eighty-five million, nine hundred one thousand, six hundred forty-eight".