640230185 has 48 divisors (see below), whose sum is σ = 927978240. Its totient is φ = 415324800.

The previous prime is 640230179. The next prime is 640230191. The reversal of 640230185 is 581032046.

It is an interprime number because it is at equal distance from previous prime (640230179) and next prime (640230191).

It is not a de Polignac number, because 640230185 - 2⁴ = 640230169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2795651 + ... + 2795879.

It is an arithmetic number, because the mean of its divisors is an integer number (19332880).

Almost surely, 2^640230185 is an apocalyptic number.

It is an amenable number.

640230185 is a deficient number, since it is larger than the sum of its proper divisors (287748055).

640230185 is a wasteful number, since it uses less digits than its factorization.

640230185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 640230185 is about 25302.7703028740. The cubic root of 640230185 is about 861.8771799932.

The spelling of 640230185 in words is "six hundred forty million, two hundred thirty thousand, one hundred eighty-five".