2781642398 has 4 divisors (see below), whose sum is σ = 4172463600. Its totient is φ = 1390821198.

The previous prime is 2781642397. The next prime is 2781642403. The reversal of 2781642398 is 8932461872.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781642397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695410598 + ... + 695410601.

It is an arithmetic number, because the mean of its divisors is an integer number (1043115900).

Almost surely, 2^2781642398 is an apocalyptic number.

2781642398 is a deficient number, since it is larger than the sum of its proper divisors (1390821202).

2781642398 is a wasteful number, since it uses less digits than its factorization.

2781642398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390821201.

The product of its digits is 1161216, while the sum is 50.

The square root of 2781642398 is about 52741.2779329436. The cubic root of 2781642398 is about 1406.3727161307.

The spelling of 2781642398 in words is "two billion, seven hundred eighty-one million, six hundred forty-two thousand, three hundred ninety-eight".