6340687634 has 4 divisors (see below), whose sum is σ = 9511031454. Its totient is φ = 3170343816.

The previous prime is 6340687631. The next prime is 6340687649. The reversal of 6340687634 is 4367860436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3221130025 + 3119557609 = 56755^2 + 55853^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6340687631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1585171907 + ... + 1585171910.

Almost surely, 2^6340687634 is an apocalyptic number.

6340687634 is a deficient number, since it is larger than the sum of its proper divisors (3170343820).

6340687634 is a wasteful number, since it uses less digits than its factorization.

6340687634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170343819.

The product of its (nonzero) digits is 1741824, while the sum is 47.

The square root of 6340687634 is about 79628.4348332931. The cubic root of 6340687634 is about 1850.8822316598.

The spelling of 6340687634 in words is "six billion, three hundred forty million, six hundred eighty-seven thousand, six hundred thirty-four".