640901126 has 8 divisors (see below), whose sum is σ = 962542440. Its totient is φ = 320053648.

The previous prime is 640901119. The next prime is 640901137. The reversal of 640901126 is 621109046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 196436 + ... + 199671.

It is an arithmetic number, because the mean of its divisors is an integer number (120317805).

Almost surely, 2^640901126 is an apocalyptic number.

640901126 is a deficient number, since it is larger than the sum of its proper divisors (321641314).

640901126 is a wasteful number, since it uses less digits than its factorization.

640901126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396918.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 640901126 is about 25316.0250829391. The cubic root of 640901126 is about 862.1781482312.

The spelling of 640901126 in words is "six hundred forty million, nine hundred one thousand, one hundred twenty-six".