1640640790 has 8 divisors (see below), whose sum is σ = 2953153440. Its totient is φ = 656256312.

The previous prime is 1640640739. The next prime is 1640640817. The reversal of 1640640790 is 970460461.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82032030 + ... + 82032049.

It is an arithmetic number, because the mean of its divisors is an integer number (369144180).

Almost surely, 2^1640640790 is an apocalyptic number.

1640640790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640640790 is a deficient number, since it is larger than the sum of its proper divisors (1312512650).

1640640790 is a wasteful number, since it uses less digits than its factorization.

1640640790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164064086.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 1640640790 is about 40504.8242805718. The cubic root of 1640640790 is about 1179.4272788073.

The spelling of 1640640790 in words is "one billion, six hundred forty million, six hundred forty thousand, seven hundred ninety".