640607 has 4 divisors (see below), whose sum is σ = 698856. Its totient is φ = 582360.

The previous prime is 640589. The next prime is 640613. The reversal of 640607 is 706046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640607 - 2¹⁸ = 378463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640607.

It is not an unprimeable number, because it can be changed into a prime (640667) 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, 29108 + ... + 29129.

It is an arithmetic number, because the mean of its divisors is an integer number (174714).

2⁶⁴⁰⁶⁰⁷ is an apocalyptic number.

640607 is a deficient number, since it is larger than the sum of its proper divisors (58249).

640607 is a wasteful number, since it uses less digits than its factorization.

640607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58248.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 640607 is about 800.3792850893. The cubic root of 640607 is about 86.2046236146.

The spelling of 640607 in words is "six hundred forty thousand, six hundred seven".