2678491757 has 8 divisors (see below), whose sum is σ = 2723568120. Its totient is φ = 2633748480.

The previous prime is 2678491727. The next prime is 2678491847. The reversal of 2678491757 is 7571948762.

It can be written as a sum of positive squares in 4 ways, for example, as 54081316 + 2624410441 = 7354^2 + 51229^2 .

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-2678491757 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 (2678491727) 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, 67028 + ... + 99245.

It is an arithmetic number, because the mean of its divisors is an integer number (340446015).

Almost surely, 2^2678491757 is an apocalyptic number.

It is an amenable number.

2678491757 is a deficient number, since it is larger than the sum of its proper divisors (45076363).

2678491757 is a wasteful number, since it uses less digits than its factorization.

2678491757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166543.

The product of its digits is 5927040, while the sum is 56.

The square root of 2678491757 is about 51754.1472444480. The cubic root of 2678491757 is about 1388.7692912372.

The spelling of 2678491757 in words is "two billion, six hundred seventy-eight million, four hundred ninety-one thousand, seven hundred fifty-seven".