640889301 has 8 divisors (see below), whose sum is σ = 920251360. Its totient is φ = 394393392.

The previous prime is 640889287. The next prime is 640889311. The reversal of 640889301 is 103988046.

640889301 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 640889301 - 2¹⁷ = 640758229 is a prime.

It is a super-2 number, since 2×640889301² = 821478192272537202, which contains 22 as substring.

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: 16433059 = 640889301 / (6 + 4 + 0 + 8 + 8 + 9 + 3 + 0 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640889301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640889311) 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, 8216491 + ... + 8216568.

It is an arithmetic number, because the mean of its divisors is an integer number (115031420).

Almost surely, 2^640889301 is an apocalyptic number.

It is an amenable number.

640889301 is a deficient number, since it is larger than the sum of its proper divisors (279362059).

640889301 is a wasteful number, since it uses less digits than its factorization.

640889301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16433075.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 640889301 is about 25315.7915341393. The cubic root of 640889301 is about 862.1728456352.

The spelling of 640889301 in words is "six hundred forty million, eight hundred eighty-nine thousand, three hundred one".