640424719 has 32 divisors (see below), whose sum is σ = 759767040. Its totient is φ = 533702400.

The previous prime is 640424699. The next prime is 640424737. The reversal of 640424719 is 917424046.

It is a happy number.

It is not a de Polignac number, because 640424719 - 2⁷ = 640424591 is a prime.

It is a super-2 number, since 2×640424719² = 820287641412457922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640424789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1401139 + ... + 1401595.

It is an arithmetic number, because the mean of its divisors is an integer number (23742720).

Almost surely, 2^640424719 is an apocalyptic number.

640424719 is a deficient number, since it is larger than the sum of its proper divisors (119342321).

640424719 is a wasteful number, since it uses less digits than its factorization.

640424719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 640424719 is about 25306.6141354390. The cubic root of 640424719 is about 861.9644649732.

The spelling of 640424719 in words is "six hundred forty million, four hundred twenty-four thousand, seven hundred nineteen".