820448640426 has 8 divisors (see below), whose sum is σ = 1640897280864. Its totient is φ = 273482880140.

The previous prime is 820448640419. The next prime is 820448640439. The reversal of 820448640426 is 624046844028.

It is a sphenic number, since it is the product of 3 distinct primes.

820448640426 is an admirable number.

It is a super-3 number, since 3×820448640426³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68370720030 + ... + 68370720041.

It is an arithmetic number, because the mean of its divisors is an integer number (205112160108).

Almost surely, 2^820448640426 is an apocalyptic number.

820448640426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

820448640426 is a wasteful number, since it uses less digits than its factorization.

820448640426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136741440076.

The product of its (nonzero) digits is 2359296, while the sum is 48.

The spelling of 820448640426 in words is "eight hundred twenty billion, four hundred forty-eight million, six hundred forty thousand, four hundred twenty-six".