2978734801986 has 96 divisors (see below), whose sum is σ = 7091511223680. Its totient is φ = 899433849600.

The previous prime is 2978734801937. The next prime is 2978734801997. The reversal of 2978734801986 is 6891084378792.

2978734801986 is a `hidden beast` number, since 2 + 9 + 78 + 73 + 480 + 1 + 9 + 8 + 6 = 666.

It is a super-2 number, since 2×2978734801986² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22438446 + ... + 22570806.

It is an arithmetic number, because the mean of its divisors is an integer number (73869908580).

Almost surely, 2^{2978734801986} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2978734801986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3545755611840).

2978734801986 is an abundant number, since it is smaller than the sum of its proper divisors (4112776421694).

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

2978734801986 is a wasteful number, since it uses less digits than its factorization.

2978734801986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135272 (or 135269 counting only the distinct ones).

The product of its (nonzero) digits is 292626432, while the sum is 72.

The spelling of 2978734801986 in words is "two trillion, nine hundred seventy-eight billion, seven hundred thirty-four million, eight hundred one thousand, nine hundred eighty-six".