640417126 has 16 divisors (see below), whose sum is σ = 988269984. Its totient is φ = 311111424.

The previous prime is 640417117. The next prime is 640417139. The reversal of 640417126 is 621714046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18411 + ... + 40246.

It is an arithmetic number, because the mean of its divisors is an integer number (61766874).

Almost surely, 2^640417126 is an apocalyptic number.

640417126 is a deficient number, since it is larger than the sum of its proper divisors (347852858).

640417126 is a wasteful number, since it uses less digits than its factorization.

640417126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58815.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 640417126 is about 25306.4641149253. The cubic root of 640417126 is about 861.9610584203.

The spelling of 640417126 in words is "six hundred forty million, four hundred seventeen thousand, one hundred twenty-six".