2781397957 has 8 divisors (see below), whose sum is σ = 3001827584. Its totient is φ = 2561893488.

The previous prime is 2781397943. The next prime is 2781397967. The reversal of 2781397957 is 7597931872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781397957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781397937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225033 + ... + 237070.

It is an arithmetic number, because the mean of its divisors is an integer number (375228448).

Almost surely, 2^2781397957 is an apocalyptic number.

It is an amenable number.

2781397957 is a deficient number, since it is larger than the sum of its proper divisors (220429627).

2781397957 is a wasteful number, since it uses less digits than its factorization.

2781397957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462579.

The product of its digits is 6667920, while the sum is 58.

The square root of 2781397957 is about 52738.9605225587. The cubic root of 2781397957 is about 1406.3315192197.

The spelling of 2781397957 in words is "two billion, seven hundred eighty-one million, three hundred ninety-seven thousand, nine hundred fifty-seven".