1640618794 has 8 divisors (see below), whose sum is σ = 2461207428. Its totient is φ = 820216320.

The previous prime is 1640618767. The next prime is 1640618803. The reversal of 1640618794 is 4978160461.

It can be written as a sum of positive squares in 2 ways, for example, as 1630140625 + 10478169 = 40375^2 + 3237^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21897 + ... + 61324.

Almost surely, 2^1640618794 is an apocalyptic number.

1640618794 is a deficient number, since it is larger than the sum of its proper divisors (820588634).

1640618794 is an equidigital number, since it uses as much as digits as its factorization.

1640618794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93080.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 1640618794 is about 40504.5527564495. The cubic root of 1640618794 is about 1179.4220079403.

The spelling of 1640618794 in words is "one billion, six hundred forty million, six hundred eighteen thousand, seven hundred ninety-four".