8178642 has 24 divisors (see below), whose sum is σ = 18056844. Its totient is φ = 2674464.

The previous prime is 8178631. The next prime is 8178647. The reversal of 8178642 is 2468718.

8178642 is a `hidden beast` number, since 8 + 1 + 7 + 8 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8173881 + 4761 = 2859^2 + 69^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8178597 and 8178606.

It is not an unprimeable number, because it can be changed into a prime (8178647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3333 + ... + 5240.

Almost surely, 2^8178642 is an apocalyptic number.

8178642 is an abundant number, since it is smaller than the sum of its proper divisors (9878202).

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

8178642 is a wasteful number, since it uses less digits than its factorization.

8178642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8634 (or 8631 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 8178642 is about 2859.8325125783. The cubic root of 8178642 is about 201.4777378956.

The spelling of 8178642 in words is "eight million, one hundred seventy-eight thousand, six hundred forty-two".