640037109 has 8 divisors (see below), whose sum is σ = 853499680. Its totient is φ = 426632976.

The previous prime is 640037093. The next prime is 640037143. The reversal of 640037109 is 901730046.

It is a happy number.

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

It is not a de Polignac number, because 640037109 - 2⁴ = 640037093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640037149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35754 + ... + 50580.

It is an arithmetic number, because the mean of its divisors is an integer number (106687460).

Almost surely, 2^640037109 is an apocalyptic number.

It is an amenable number.

640037109 is a deficient number, since it is larger than the sum of its proper divisors (213462571).

640037109 is a wasteful number, since it uses less digits than its factorization.

640037109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29219.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 640037109 is about 25298.9547017263. The cubic root of 640037109 is about 861.7905317152.

It can be divided in two parts, 640037 and 109, that added together give a triangular number (640146 = T₁₁₃₁).

The spelling of 640037109 in words is "six hundred forty million, thirty-seven thousand, one hundred nine".