64345486920 has 256 divisors, whose sum is σ = 232317953280. Its totient is φ = 14047641600.

The previous prime is 64345486883. The next prime is 64345486921. The reversal of 64345486920 is 2968454346.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64345486921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 657832 + ... + 749288.

It is an arithmetic number, because the mean of its divisors is an integer number (907492005).

Almost surely, 2^64345486920 is an apocalyptic number.

64345486920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64345486920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116158976640).

64345486920 is an abundant number, since it is smaller than the sum of its proper divisors (167972466360).

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

64345486920 is a wasteful number, since it uses less digits than its factorization.

64345486920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91536 (or 91532 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 51.

The spelling of 64345486920 in words is "sixty-four billion, three hundred forty-five million, four hundred eighty-six thousand, nine hundred twenty".