64729289231920 has 40 divisors (see below), whose sum is σ = 150516858224160. Its totient is φ = 25888057927680.

The previous prime is 64729289231863. The next prime is 64729289231927. The reversal of 64729289231920 is 2913298292746.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (64729289231927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56582721 + ... + 57715360.

It is an arithmetic number, because the mean of its divisors is an integer number (3762921455604).

Almost surely, 2^{64729289231920} is an apocalyptic number.

It is an amenable number.

64729289231920 is an abundant number, since it is smaller than the sum of its proper divisors (85787568992240).

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

64729289231920 is a wasteful number, since it uses less digits than its factorization.

64729289231920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114305173 (or 114305167 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 64.

The spelling of 64729289231920 in words is "sixty-four trillion, seven hundred twenty-nine billion, two hundred eighty-nine million, two hundred thirty-one thousand, nine hundred twenty".