64639950 has 48 divisors (see below), whose sum is σ = 169743600. Its totient is φ = 16222720.

The previous prime is 64639921. The next prime is 64639951. The reversal of 64639950 is 5993646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64639951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10125 + ... + 15224.

It is an arithmetic number, because the mean of its divisors is an integer number (3536325).

Almost surely, 2^64639950 is an apocalyptic number.

64639950 is an abundant number, since it is smaller than the sum of its proper divisors (105103650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64639950 is a wasteful number, since it uses less digits than its factorization.

64639950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25381 (or 25376 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 64639950 is about 8039.8973874049. The cubic root of 64639950 is about 401.3288099389.

The spelling of 64639950 in words is "sixty-four million, six hundred thirty-nine thousand, nine hundred fifty".