855556240 has 80 divisors (see below), whose sum is σ = 2480019840. Its totient is φ = 266664960.

The previous prime is 855556237. The next prime is 855556241. The reversal of 855556240 is 42655558.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 855556193 and 855556202.

It is not an unprimeable number, because it can be changed into a prime (855556241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63285 + ... + 75604.

It is an arithmetic number, because the mean of its divisors is an integer number (31000248).

Almost surely, 2^855556240 is an apocalyptic number.

855556240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

855556240 is an abundant number, since it is smaller than the sum of its proper divisors (1624463600).

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

855556240 is a wasteful number, since it uses less digits than its factorization.

855556240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138920 (or 138914 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The square root of 855556240 is about 29249.8929912573. The cubic root of 855556240 is about 949.3277755973.

The spelling of 855556240 in words is "eight hundred fifty-five million, five hundred fifty-six thousand, two hundred forty".