2678996391696 has 45 divisors (see below), whose sum is σ = 7497524036821. Its totient is φ = 892992250176.

The previous prime is 2678996391689. The next prime is 2678996391727. The reversal of 2678996391696 is 6961936998762.

The square root of 2678996391696 is 1636764.

It is a perfect power (a square), and thus also a powerful number.

2678996391696 is a `hidden beast` number, since 2 + 6 + 7 + 89 + 96 + 391 + 69 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 289078275600 + 2389918116096 = 537660^2 + 1545936^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19572970 + ... + 19709366.

Almost surely, 2^{2678996391696} is an apocalyptic number.

2678996391696 is the 1636764-th square number.

It is an amenable number.

2678996391696 is an abundant number, since it is smaller than the sum of its proper divisors (4818527645125).

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

2678996391696 is an frugal number, since it uses more digits than its factorization.

2678996391696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272808 (or 136402 counting only the distinct ones).

The product of its digits is 2857026816, while the sum is 81.

Multiplying 2678996391696 by its sum of digits (81), we get a square (216998707727376 = 14730876²).

The spelling of 2678996391696 in words is "two trillion, six hundred seventy-eight billion, nine hundred ninety-six million, three hundred ninety-one thousand, six hundred ninety-six".