640211302 has 8 divisors (see below), whose sum is σ = 1002069936. Its totient is φ = 306187992.

The previous prime is 640211267. The next prime is 640211399. The reversal of 640211302 is 203112046.

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

It is a super-2 number, since 2×640211302² = 819741022417070408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640211302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6958773 + ... + 6958864.

It is an arithmetic number, because the mean of its divisors is an integer number (125258742).

Almost surely, 2^640211302 is an apocalyptic number.

640211302 is a deficient number, since it is larger than the sum of its proper divisors (361858634).

640211302 is a wasteful number, since it uses less digits than its factorization.

640211302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13917662.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 640211302 is about 25302.3971591626. The cubic root of 640211302 is about 861.8687064852.

Adding to 640211302 its reverse (203112046), we get a palindrome (843323348).

The spelling of 640211302 in words is "six hundred forty million, two hundred eleven thousand, three hundred two".