64819339488 has 72 divisors (see below), whose sum is σ = 184524198768. Its totient is φ = 21583683072.

The previous prime is 64819339463. The next prime is 64819339489. The reversal of 64819339488 is 88493391846.

64819339488 is a `hidden beast` number, since 6 + 4 + 81 + 93 + 394 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×64819339488² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64819339489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156381 + ... + 392547.

It is an arithmetic number, because the mean of its divisors is an integer number (2562836094).

Almost surely, 2^64819339488 is an apocalyptic number.

It is an amenable number.

64819339488 is an abundant number, since it is smaller than the sum of its proper divisors (119704859280).

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

64819339488 is a wasteful number, since it uses less digits than its factorization.

64819339488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237136 (or 237125 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The spelling of 64819339488 in words is "sixty-four billion, eight hundred nineteen million, three hundred thirty-nine thousand, four hundred eighty-eight".