820626428 has 12 divisors (see below), whose sum is σ = 1441819512. Its totient is φ = 408678000.

The previous prime is 820626413. The next prime is 820626437. The reversal of 820626428 is 824626028.

It is a junction number, because it is equal to n+sod(n) for n = 820626391 and 820626400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407675 + ... + 409682.

It is an arithmetic number, because the mean of its divisors is an integer number (120151626).

Almost surely, 2^820626428 is an apocalyptic number.

It is an amenable number.

820626428 is a deficient number, since it is larger than the sum of its proper divisors (621193084).

820626428 is a wasteful number, since it uses less digits than its factorization.

820626428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817612 (or 817610 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 820626428 is about 28646.5779457163. The cubic root of 820626428 is about 936.2284473557.

The spelling of 820626428 in words is "eight hundred twenty million, six hundred twenty-six thousand, four hundred twenty-eight".