640233735 has 16 divisors (see below), whose sum is σ = 1041168480. Its totient is φ = 335859840.

The previous prime is 640233733. The next prime is 640233761. The reversal of 640233735 is 537332046.

It is not a de Polignac number, because 640233735 - 2¹ = 640233733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640233696 and 640233705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640233733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348940 + ... + 350769.

It is an arithmetic number, because the mean of its divisors is an integer number (65073030).

Almost surely, 2^640233735 is an apocalyptic number.

640233735 is a deficient number, since it is larger than the sum of its proper divisors (400934745).

640233735 is a wasteful number, since it uses less digits than its factorization.

640233735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699778.

The product of its (nonzero) digits is 45360, while the sum is 33.

The square root of 640233735 is about 25302.8404531981. The cubic root of 640233735 is about 861.8787729923.

The spelling of 640233735 in words is "six hundred forty million, two hundred thirty-three thousand, seven hundred thirty-five".