640042067 has 12 divisors (see below), whose sum is σ = 755029296. Its totient is φ = 540877680.

The previous prime is 640042063. The next prime is 640042069. The reversal of 640042067 is 760240046.

It is not a de Polignac number, because 640042067 - 2² = 640042063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640042063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88508 + ... + 95465.

It is an arithmetic number, because the mean of its divisors is an integer number (62919108).

Almost surely, 2^640042067 is an apocalyptic number.

640042067 is a deficient number, since it is larger than the sum of its proper divisors (114987229).

640042067 is a wasteful number, since it uses less digits than its factorization.

640042067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184058 (or 184051 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 640042067 is about 25299.0526897748. The cubic root of 640042067 is about 861.7927569749.

The spelling of 640042067 in words is "six hundred forty million, forty-two thousand, sixty-seven".