2820718257 has 32 divisors (see below), whose sum is σ = 4403266560. Its totient is φ = 1572540480.

The previous prime is 2820718253. The next prime is 2820718267. The reversal of 2820718257 is 7528170282.

It is not a de Polignac number, because 2820718257 - 2² = 2820718253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2820718253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1316407 + ... + 1318547.

It is an arithmetic number, because the mean of its divisors is an integer number (137602080).

Almost surely, 2^2820718257 is an apocalyptic number.

It is an amenable number.

2820718257 is a deficient number, since it is larger than the sum of its proper divisors (1582548303).

2820718257 is a wasteful number, since it uses less digits than its factorization.

2820718257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653.

The product of its (nonzero) digits is 125440, while the sum is 42.

The square root of 2820718257 is about 53110.4345397399. The cubic root of 2820718257 is about 1412.9275820620.

It can be divided in two parts, 28207 and 18257, that added together give a palindrome (46464).

The spelling of 2820718257 in words is "two billion, eight hundred twenty million, seven hundred eighteen thousand, two hundred fifty-seven".