640942035 has 16 divisors (see below), whose sum is σ = 1070095104. Its totient is φ = 326973152.

The previous prime is 640941979. The next prime is 640942039. The reversal of 640942035 is 530249046.

It is not a de Polignac number, because 640942035 - 2⁷ = 640941907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640941987 and 640942005.

It is not an unprimeable number, because it can be changed into a prime (640942039) 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, 928557 + ... + 929246.

It is an arithmetic number, because the mean of its divisors is an integer number (66880944).

Almost surely, 2^640942035 is an apocalyptic number.

640942035 is a deficient number, since it is larger than the sum of its proper divisors (429153069).

640942035 is a wasteful number, since it uses less digits than its factorization.

640942035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857834.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 640942035 is about 25316.8330365391. The cubic root of 640942035 is about 862.1964922441.

The spelling of 640942035 in words is "six hundred forty million, nine hundred forty-two thousand, thirty-five".