640980093 has 8 divisors (see below), whose sum is σ = 920381728. Its totient is φ = 394449264.

The previous prime is 640980091. The next prime is 640980097. The reversal of 640980093 is 390089046.

640980093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 640980093 - 2¹ = 640980091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 16435387 = 640980093 / (6 + 4 + 0 + 9 + 8 + 0 + 0 + 9 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640980091) 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, 8217655 + ... + 8217732.

It is an arithmetic number, because the mean of its divisors is an integer number (115047716).

Almost surely, 2^640980093 is an apocalyptic number.

It is an amenable number.

640980093 is a deficient number, since it is larger than the sum of its proper divisors (279401635).

640980093 is a wasteful number, since it uses less digits than its factorization.

640980093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16435403.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 640980093 is about 25317.5846596787. The cubic root of 640980093 is about 862.2135571386.

The spelling of 640980093 in words is "six hundred forty million, nine hundred eighty thousand, ninety-three".