855138828 has 24 divisors (see below), whose sum is σ = 2112696432. Its totient is φ = 268278784.

The previous prime is 855138799. The next prime is 855138841. The reversal of 855138828 is 828831558.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2095725 + ... + 2096132.

It is an arithmetic number, because the mean of its divisors is an integer number (88029018).

Almost surely, 2^855138828 is an apocalyptic number.

It is an amenable number.

855138828 is an abundant number, since it is smaller than the sum of its proper divisors (1257557604).

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

855138828 is a wasteful number, since it uses less digits than its factorization.

855138828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4191881 (or 4191879 counting only the distinct ones).

The product of its digits is 614400, while the sum is 48.

The square root of 855138828 is about 29242.7568467817. The cubic root of 855138828 is about 949.1733632795.

The spelling of 855138828 in words is "eight hundred fifty-five million, one hundred thirty-eight thousand, eight hundred twenty-eight".