1640068627 has 4 divisors (see below), whose sum is σ = 1642744720. Its totient is φ = 1637392536.

The previous prime is 1640068621. The next prime is 1640068637. The reversal of 1640068627 is 7268600461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640068627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640068627.

It is not an unprimeable number, because it can be changed into a prime (1640068621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1337127 + ... + 1338352.

It is an arithmetic number, because the mean of its divisors is an integer number (410686180).

Almost surely, 2^1640068627 is an apocalyptic number.

1640068627 is a deficient number, since it is larger than the sum of its proper divisors (2676093).

1640068627 is an equidigital number, since it uses as much as digits as its factorization.

1640068627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676092.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1640068627 is about 40497.7607652571. The cubic root of 1640068627 is about 1179.2901569550.

The spelling of 1640068627 in words is "one billion, six hundred forty million, sixty-eight thousand, six hundred twenty-seven".