64819892472 has 128 divisors (see below), whose sum is σ = 175177728000. Its totient is φ = 19924894080.

The previous prime is 64819892443. The next prime is 64819892477. The reversal of 64819892472 is 27429891846.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64819892477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2545033 + ... + 2570375.

It is an arithmetic number, because the mean of its divisors is an integer number (1368576000).

Almost surely, 2^64819892472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64819892472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87588864000).

64819892472 is an abundant number, since it is smaller than the sum of its proper divisors (110357835528).

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

64819892472 is a wasteful number, since it uses less digits than its factorization.

64819892472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25521 (or 25517 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 60.

The spelling of 64819892472 in words is "sixty-four billion, eight hundred nineteen million, eight hundred ninety-two thousand, four hundred seventy-two".