1640879698 has 8 divisors (see below), whose sum is σ = 2513688192. Its totient is φ = 802983636.

The previous prime is 1640879683. The next prime is 1640879707. The reversal of 1640879698 is 8969780461.

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, 8727990 + ... + 8728177.

It is an arithmetic number, because the mean of its divisors is an integer number (314211024).

Almost surely, 2^1640879698 is an apocalyptic number.

1640879698 is a deficient number, since it is larger than the sum of its proper divisors (872808494).

1640879698 is a wasteful number, since it uses less digits than its factorization.

1640879698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17456216.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 1640879698 is about 40507.7733034044. The cubic root of 1640879698 is about 1179.4845249228.

The spelling of 1640879698 in words is "one billion, six hundred forty million, eight hundred seventy-nine thousand, six hundred ninety-eight".