640055954 has 8 divisors (see below), whose sum is σ = 976356720. Its totient is φ = 314603716.

The previous prime is 640055953. The next prime is 640055959. The reversal of 640055954 is 459550046.

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

It is not an unprimeable number, because it can be changed into a prime (640055951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2711984 + ... + 2712219.

It is an arithmetic number, because the mean of its divisors is an integer number (122044590).

Almost surely, 2^640055954 is an apocalyptic number.

640055954 is a deficient number, since it is larger than the sum of its proper divisors (336300766).

640055954 is a wasteful number, since it uses less digits than its factorization.

640055954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424264.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 640055954 is about 25299.3271452029. The cubic root of 640055954 is about 861.7989897056.

The spelling of 640055954 in words is "six hundred forty million, fifty-five thousand, nine hundred fifty-four".