2178046542 has 64 divisors (see below), whose sum is σ = 5058616320. Its totient is φ = 612313344.

The previous prime is 2178046489. The next prime is 2178046543. The reversal of 2178046542 is 2456408712.

It is a self number, because there is not a number n which added to its sum of digits gives 2178046542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178046543) 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, 2369559 + ... + 2370477.

It is an arithmetic number, because the mean of its divisors is an integer number (79040880).

Almost surely, 2^2178046542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178046542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2529308160).

2178046542 is an abundant number, since it is smaller than the sum of its proper divisors (2880569778).

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

2178046542 is a wasteful number, since it uses less digits than its factorization.

2178046542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777.

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 2178046542 is about 46669.5461944939. The cubic root of 2178046542 is about 1296.2508433162.

The spelling of 2178046542 in words is "two billion, one hundred seventy-eight million, forty-six thousand, five hundred forty-two".