1640548690 has 64 divisors (see below), whose sum is σ = 3306510720. Its totient is φ = 581002240.

The previous prime is 1640548687. The next prime is 1640548727. The reversal of 1640548690 is 968450461.

It is a super-2 number, since 2×1640548690² = 5382800008521432200, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 732252 + ... + 734488.

It is an arithmetic number, because the mean of its divisors is an integer number (51664230).

Almost surely, 2^1640548690 is an apocalyptic number.

1640548690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640548690 is an abundant number, since it is smaller than the sum of its proper divisors (1665962030).

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

1640548690 is a wasteful number, since it uses less digits than its factorization.

1640548690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1640548690 is about 40503.6873630044. The cubic root of 1640548690 is about 1179.4052087142.

The spelling of 1640548690 in words is "one billion, six hundred forty million, five hundred forty-eight thousand, six hundred ninety".