8256420942 has 128 divisors (see below), whose sum is σ = 21150720000. Its totient is φ = 2086608000.

The previous prime is 8256420937. The next prime is 8256420947. The reversal of 8256420942 is 2490246528.

It is an interprime number because it is at equal distance from previous prime (8256420937) and next prime (8256420947).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 8256420894 and 8256420903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8256420947) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2751559 + ... + 2754557.

It is an arithmetic number, because the mean of its divisors is an integer number (165240000).

Almost surely, 2^8256420942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8256420942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10575360000).

8256420942 is an abundant number, since it is smaller than the sum of its proper divisors (12894299058).

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

8256420942 is a wasteful number, since it uses less digits than its factorization.

8256420942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 8256420942 is about 90864.8498705633. The cubic root of 8256420942 is about 2021.1440878626.

The spelling of 8256420942 in words is "eight billion, two hundred fifty-six million, four hundred twenty thousand, nine hundred forty-two".