2057658749 has 8 divisors (see below), whose sum is σ = 2067871032. Its totient is φ = 2047467520.

The previous prime is 2057658737. The next prime is 2057658773. The reversal of 2057658749 is 9478567502.

It can be written as a sum of positive squares in 4 ways, for example, as 521802649 + 1535856100 = 22843^2 + 39190^2 .

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-2057658749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2057658749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2057658149) 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, 212477 + ... + 221949.

It is an arithmetic number, because the mean of its divisors is an integer number (258483879).

Almost surely, 2^2057658749 is an apocalyptic number.

It is an amenable number.

2057658749 is a deficient number, since it is larger than the sum of its proper divisors (10212283).

2057658749 is an equidigital number, since it uses as much as digits as its factorization.

2057658749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10527.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The square root of 2057658749 is about 45361.4235777494. The cubic root of 2057658749 is about 1271.9141056291.

The spelling of 2057658749 in words is "two billion, fifty-seven million, six hundred fifty-eight thousand, seven hundred forty-nine".