640092018 has 8 divisors (see below), whose sum is σ = 1280184048. Its totient is φ = 213364004.

The previous prime is 640091993. The next prime is 640092043. The reversal of 640092018 is 810290046.

It is an interprime number because it is at equal distance from previous prime (640091993) and next prime (640092043).

It is a sphenic number, since it is the product of 3 distinct primes.

640092018 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53340996 + ... + 53341007.

It is an arithmetic number, because the mean of its divisors is an integer number (160023006).

Almost surely, 2^640092018 is an apocalyptic number.

640092018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640092018 is a wasteful number, since it uses less digits than its factorization.

640092018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106682008.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 640092018 is about 25300.0398813915. The cubic root of 640092018 is about 861.8151754442.

The spelling of 640092018 in words is "six hundred forty million, ninety-two thousand, eighteen".