2698667978 has 8 divisors (see below), whose sum is σ = 4065376068. Its totient is φ = 1343542624.

The previous prime is 2698667969. The next prime is 2698667981. The reversal of 2698667978 is 8797668962.

2698667978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2605796209 + 92871769 = 51047^2 + 9637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2895101 + ... + 2896032.

Almost surely, 2^2698667978 is an apocalyptic number.

2698667978 is a deficient number, since it is larger than the sum of its proper divisors (1366708090).

2698667978 is a wasteful number, since it uses less digits than its factorization.

2698667978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791368.

The product of its digits is 109734912, while the sum is 68.

The square root of 2698667978 is about 51948.7052581679. The cubic root of 2698667978 is about 1392.2476235858.

The spelling of 2698667978 in words is "two billion, six hundred ninety-eight million, six hundred sixty-seven thousand, nine hundred seventy-eight".