640126598 has 4 divisors (see below), whose sum is σ = 960189900. Its totient is φ = 320063298.

The previous prime is 640126579. The next prime is 640126637. The reversal of 640126598 is 895621046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 895621046 = 2 ⋅447810523.

It is a super-2 number, since 2×640126598² = 819524122934107208, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160031648 + ... + 160031651.

It is an arithmetic number, because the mean of its divisors is an integer number (240047475).

Almost surely, 2^640126598 is an apocalyptic number.

640126598 is a deficient number, since it is larger than the sum of its proper divisors (320063302).

640126598 is a wasteful number, since it uses less digits than its factorization.

640126598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320063301.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 640126598 is about 25300.7232702941. The cubic root of 640126598 is about 861.8306945838.

The spelling of 640126598 in words is "six hundred forty million, one hundred twenty-six thousand, five hundred ninety-eight".