855430578 has 64 divisors (see below), whose sum is σ = 2029363200. Its totient is φ = 266308560.

The previous prime is 855430577. The next prime is 855430579. The reversal of 855430578 is 875034558.

It is an interprime number because it is at equal distance from previous prime (855430577) and next prime (855430579).

It is a super-2 number, since 2×855430578² = 1463522947554828168, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (855430577) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66975 + ... + 78717.

It is an arithmetic number, because the mean of its divisors is an integer number (31708800).

Almost surely, 2^855430578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855430578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014681600).

855430578 is an abundant number, since it is smaller than the sum of its proper divisors (1173932622).

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

855430578 is a wasteful number, since it uses less digits than its factorization.

855430578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11844 (or 11838 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The square root of 855430578 is about 29247.7448361408. The cubic root of 855430578 is about 949.2812950106.

The spelling of 855430578 in words is "eight hundred fifty-five million, four hundred thirty thousand, five hundred seventy-eight".