642080257 has 16 divisors (see below), whose sum is σ = 808635520. Its totient is φ = 496202112.

The previous prime is 642080251. The next prime is 642080261. The reversal of 642080257 is 752080246.

It is not a de Polignac number, because 642080257 - 2¹⁵ = 642047489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642080251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78132 + ... + 85957.

It is an arithmetic number, because the mean of its divisors is an integer number (50539720).

Almost surely, 2^642080257 is an apocalyptic number.

It is an amenable number.

642080257 is a deficient number, since it is larger than the sum of its proper divisors (166555263).

642080257 is a wasteful number, since it uses less digits than its factorization.

642080257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164152.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 642080257 is about 25339.3026147130. The cubic root of 642080257 is about 862.7065699160.

The spelling of 642080257 in words is "six hundred forty-two million, eighty thousand, two hundred fifty-seven".