2781002978 has 8 divisors (see below), whose sum is σ = 4492389468. Its totient is φ = 1283539824.

The previous prime is 2781002977. The next prime is 2781002989. The reversal of 2781002978 is 8792001872.

2781002978 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 2745445609 + 35557369 = 52397^2 + 5963^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2781002971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53480801 + ... + 53480852.

Almost surely, 2^2781002978 is an apocalyptic number.

2781002978 is a deficient number, since it is larger than the sum of its proper divisors (1711386490).

2781002978 is a wasteful number, since it uses less digits than its factorization.

2781002978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106961668.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 2781002978 is about 52735.2157291501. The cubic root of 2781002978 is about 1406.2649462563.

The spelling of 2781002978 in words is "two billion, seven hundred eighty-one million, two thousand, nine hundred seventy-eight".