640571019 has 16 divisors (see below), whose sum is σ = 934216320. Its totient is φ = 387192960.

The previous prime is 640570993. The next prime is 640571021. The reversal of 640571019 is 910175046.

640571019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640571019 - 2¹² = 640566923 is a prime.

It is a super-2 number, since 2×640571019² = 820662460765396722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (640571059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13102 + ... + 38115.

It is an arithmetic number, because the mean of its divisors is an integer number (58388520).

Almost surely, 2^640571019 is an apocalyptic number.

640571019 is a deficient number, since it is larger than the sum of its proper divisors (293645301).

640571019 is a wasteful number, since it uses less digits than its factorization.

640571019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51610.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 640571019 is about 25309.5045190537. The cubic root of 640571019 is about 862.0300963144.

The spelling of 640571019 in words is "six hundred forty million, five hundred seventy-one thousand, nineteen".