640190019 has 16 divisors (see below), whose sum is σ = 981992960. Its totient is φ = 363398400.

The previous prime is 640189999. The next prime is 640190069. The reversal of 640190019 is 910091046.

It is not a de Polignac number, because 640190019 - 2¹¹ = 640187971 is a prime.

It is a super-2 number, since 2×640190019² = 819686520854440722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640190069) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 97774 + ... + 104115.

It is an arithmetic number, because the mean of its divisors is an integer number (61374560).

Almost surely, 2^640190019 is an apocalyptic number.

640190019 is a deficient number, since it is larger than the sum of its proper divisors (341802941).

640190019 is a wasteful number, since it uses less digits than its factorization.

640190019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202050.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 640190019 is about 25301.9765828680. The cubic root of 640190019 is about 861.8591558078.

The spelling of 640190019 in words is "six hundred forty million, one hundred ninety thousand, nineteen".