640092017 has 4 divisors (see below), whose sum is σ = 640150896. Its totient is φ = 640033140.

The previous prime is 640091993. The next prime is 640092043. The reversal of 640092017 is 710290046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 710290046 = 2 ⋅355145023.

It is a cyclic number.

It is not a de Polignac number, because 640092017 - 2²⁸ = 371656561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640092067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7859 + ... + 36632.

It is an arithmetic number, because the mean of its divisors is an integer number (160037724).

Almost surely, 2^640092017 is an apocalyptic number.

It is an amenable number.

640092017 is a deficient number, since it is larger than the sum of its proper divisors (58879).

640092017 is a wasteful number, since it uses less digits than its factorization.

640092017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58878.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 640092017 is about 25300.0398616287. The cubic root of 640092017 is about 861.8151749954.

The spelling of 640092017 in words is "six hundred forty million, ninety-two thousand, seventeen".