2678191904 has 12 divisors (see below), whose sum is σ = 5272690374. Its totient is φ = 1339095936.

The previous prime is 2678191891. The next prime is 2678191931. The reversal of 2678191904 is 4091918762.

It can be written as a sum of positive squares in only one way, i.e., 2677855504 + 336400 = 51748^2 + 580^2 .

It is a super-2 number, since 2×2678191904² = 14345423749302290432, which 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 as a sum of consecutive naturals, namely, 41846717 + ... + 41846780.

Almost surely, 2^2678191904 is an apocalyptic number.

It is an amenable number.

2678191904 is a deficient number, since it is larger than the sum of its proper divisors (2594498470).

2678191904 is an equidigital number, since it uses as much as digits as its factorization.

2678191904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83693507 (or 83693499 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 2678191904 is about 51751.2502650902. The cubic root of 2678191904 is about 1388.7174657802.

The spelling of 2678191904 in words is "two billion, six hundred seventy-eight million, one hundred ninety-one thousand, nine hundred four".