640043435 has 8 divisors (see below), whose sum is σ = 768238560. Its totient is φ = 511910464.

The previous prime is 640043419. The next prime is 640043441. The reversal of 640043435 is 534340046.

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

It is a cyclic number.

It is not a de Polignac number, because 640043435 - 2⁴ = 640043419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640043398 and 640043407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11354 + ... + 37536.

It is an arithmetic number, because the mean of its divisors is an integer number (96029820).

Almost surely, 2^640043435 is an apocalyptic number.

640043435 is a deficient number, since it is larger than the sum of its proper divisors (128195125).

640043435 is a wasteful number, since it uses less digits than its factorization.

640043435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31077.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 640043435 is about 25299.0797263458. The cubic root of 640043435 is about 861.7933709615.

The spelling of 640043435 in words is "six hundred forty million, forty-three thousand, four hundred thirty-five".