820628802440 has 32 divisors (see below), whose sum is σ = 1869787152000. Its totient is φ = 324096437184.

The previous prime is 820628802439. The next prime is 820628802479. The reversal of 820628802440 is 44208826028.

It is a junction number, because it is equal to n+sod(n) for n = 820628802391 and 820628802400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129843170 + ... + 129849489.

It is an arithmetic number, because the mean of its divisors is an integer number (58430848500).

Almost surely, 2^820628802440 is an apocalyptic number.

It is an amenable number.

820628802440 is an abundant number, since it is smaller than the sum of its proper divisors (1049158349560).

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

820628802440 is a wasteful number, since it uses less digits than its factorization.

820628802440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259692749 (or 259692745 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 44.

The spelling of 820628802440 in words is "eight hundred twenty billion, six hundred twenty-eight million, eight hundred two thousand, four hundred forty".