64402782719 has 16 divisors (see below), whose sum is σ = 74370510720. Its totient is φ = 55214446560.

The previous prime is 64402782707. The next prime is 64402782749. The reversal of 64402782719 is 91728720446.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64402782719 - 2³² = 60107815423 is a prime.

It is a super-2 number, since 2×64402782719² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64402782749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2333837 + ... + 2361270.

It is an arithmetic number, because the mean of its divisors is an integer number (4648156920).

Almost surely, 2^64402782719 is an apocalyptic number.

64402782719 is a deficient number, since it is larger than the sum of its proper divisors (9967728001).

64402782719 is a wasteful number, since it uses less digits than its factorization.

64402782719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695190.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 64402782719 in words is "sixty-four billion, four hundred two million, seven hundred eighty-two thousand, seven hundred nineteen".