64728989934 has 32 divisors (see below), whose sum is σ = 148005712896. Its totient is φ = 18487280160.

The previous prime is 64728989933. The next prime is 64728989939. The reversal of 64728989934 is 43998982746.

It is a super-3 number, since 3×64728989934³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64728989933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162277 + ... + 394704.

It is an arithmetic number, because the mean of its divisors is an integer number (4625178528).

Almost surely, 2^64728989934 is an apocalyptic number.

64728989934 is an abundant number, since it is smaller than the sum of its proper divisors (83276722962).

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

64728989934 is a wasteful number, since it uses less digits than its factorization.

64728989934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559760.

The product of its digits is 188116992, while the sum is 69.

The spelling of 64728989934 in words is "sixty-four billion, seven hundred twenty-eight million, nine hundred eighty-nine thousand, nine hundred thirty-four".