855615820 has 24 divisors (see below), whose sum is σ = 1819540800. Its totient is φ = 337913472.

The previous prime is 855615811. The next prime is 855615821. The reversal of 855615820 is 28516558.

It is not an unprimeable number, because it can be changed into a prime (855615821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269185 + ... + 272344.

It is an arithmetic number, because the mean of its divisors is an integer number (75814200).

Almost surely, 2^855615820 is an apocalyptic number.

It is an amenable number.

855615820 is an abundant number, since it is smaller than the sum of its proper divisors (963924980).

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

855615820 is a wasteful number, since it uses less digits than its factorization.

855615820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541617 (or 541615 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 855615820 is about 29250.9114387911. The cubic root of 855615820 is about 949.3498118015.

The spelling of 855615820 in words is "eight hundred fifty-five million, six hundred fifteen thousand, eight hundred twenty".