640971410 has 8 divisors (see below), whose sum is σ = 1153748556. Its totient is φ = 256388560.

The previous prime is 640971389. The next prime is 640971437. The reversal of 640971410 is 14179046.

It can be written as a sum of positive squares in 2 ways, for example, as 520432969 + 120538441 = 22813^2 + 10979^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32048561 + ... + 32048580.

Almost surely, 2^640971410 is an apocalyptic number.

640971410 is a deficient number, since it is larger than the sum of its proper divisors (512777146).

640971410 is a wasteful number, since it uses less digits than its factorization.

640971410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64097148.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 640971410 is about 25317.4131774950. The cubic root of 640971410 is about 862.2096638122.

The spelling of 640971410 in words is "six hundred forty million, nine hundred seventy-one thousand, four hundred ten".