640101254 has 32 divisors (see below), whose sum is σ = 1049086080. Its totient is φ = 291151872.

The previous prime is 640101233. The next prime is 640101263. The reversal of 640101254 is 452101046.

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 in 15 ways as a sum of consecutive naturals, for example, 889907 + ... + 890625.

It is an arithmetic number, because the mean of its divisors is an integer number (32783940).

Almost surely, 2^640101254 is an apocalyptic number.

640101254 is a deficient number, since it is larger than the sum of its proper divisors (408984826).

640101254 is a wasteful number, since it uses less digits than its factorization.

640101254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 640101254 is about 25300.2224100896. Note that the first 3 decimals coincide. The cubic root of 640101254 is about 861.8193205184.

The spelling of 640101254 in words is "six hundred forty million, one hundred one thousand, two hundred fifty-four".