64784228636540 has 96 divisors (see below), whose sum is σ = 167085294566400. Its totient is φ = 20593145447424.

The previous prime is 64784228636503. The next prime is 64784228636573. The reversal of 64784228636540 is 4563682248746.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202976840 + ... + 203295759.

It is an arithmetic number, because the mean of its divisors is an integer number (1740471818400).

Almost surely, 2^{64784228636540} is an apocalyptic number.

It is an amenable number.

64784228636540 is an abundant number, since it is smaller than the sum of its proper divisors (102301065929860).

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

64784228636540 is a wasteful number, since it uses less digits than its factorization.

64784228636540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406272699 (or 406272697 counting only the distinct ones).

The product of its (nonzero) digits is 371589120, while the sum is 65.

The spelling of 64784228636540 in words is "sixty-four trillion, seven hundred eighty-four billion, two hundred twenty-eight million, six hundred thirty-six thousand, five hundred forty".