640620620435 has 8 divisors (see below), whose sum is σ = 768788192256. Its totient is φ = 512467531200.

The previous prime is 640620620329. The next prime is 640620620461. The reversal of 640620620435 is 534026026046.

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

It is not a de Polignac number, because 640620620435 - 2⁸ = 640620620179 is a prime.

It is a super-3 number, since 3×640620620435³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3523091 + ... + 3700460.

It is an arithmetic number, because the mean of its divisors is an integer number (96098524032).

Almost surely, 2^640620620435 is an apocalyptic number.

640620620435 is a deficient number, since it is larger than the sum of its proper divisors (128167571821).

640620620435 is a wasteful number, since it uses less digits than its factorization.

640620620435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7241293.

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 640620620435 in words is "six hundred forty billion, six hundred twenty million, six hundred twenty thousand, four hundred thirty-five".