2491979678 has 8 divisors (see below), whose sum is σ = 3760353072. Its totient is φ = 1238528656.

The previous prime is 2491979669. The next prime is 2491979681. The reversal of 2491979678 is 8769791942.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2491979678.

It is a congruent number.

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, 3730175 + ... + 3730842.

It is an arithmetic number, because the mean of its divisors is an integer number (470044134).

Almost surely, 2^2491979678 is an apocalyptic number.

2491979678 is a deficient number, since it is larger than the sum of its proper divisors (1268373394).

2491979678 is a wasteful number, since it uses less digits than its factorization.

2491979678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7461186.

The product of its digits is 13716864, while the sum is 62.

The square root of 2491979678 is about 49919.7323510453. The cubic root of 2491979678 is about 1355.7558865795.

The spelling of 2491979678 in words is "two billion, four hundred ninety-one million, nine hundred seventy-nine thousand, six hundred seventy-eight".