1640170770 has 64 divisors (see below), whose sum is σ = 4508199936. Its totient is φ = 374109120.

The previous prime is 1640170747. The next prime is 1640170783. The reversal of 1640170770 is 770710461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95157 + ... + 111063.

It is an arithmetic number, because the mean of its divisors is an integer number (70440624).

Almost surely, 2^1640170770 is an apocalyptic number.

1640170770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640170770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2254099968).

1640170770 is an abundant number, since it is smaller than the sum of its proper divisors (2868029166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640170770 is a wasteful number, since it uses less digits than its factorization.

1640170770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16415.

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 1640170770 is about 40499.0218400395. The cubic root of 1640170770 is about 1179.3146383968.

The spelling of 1640170770 in words is "one billion, six hundred forty million, one hundred seventy thousand, seven hundred seventy".