64402620447 has 16 divisors (see below), whose sum is σ = 95074699392. Its totient is φ = 38449324320.

The previous prime is 64402620439. The next prime is 64402620449. The reversal of 64402620447 is 74402620446.

It is a happy number.

It is not a de Polignac number, because 64402620447 - 2³ = 64402620439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64402620449) 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 15 ways as a sum of consecutive naturals, for example, 14561928 + ... + 14566349.

It is an arithmetic number, because the mean of its divisors is an integer number (5942168712).

Almost surely, 2^64402620447 is an apocalyptic number.

64402620447 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

64402620447 is a deficient number, since it is larger than the sum of its proper divisors (30672078945).

64402620447 is a wasteful number, since it uses less digits than its factorization.

64402620447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29128358.

The product of its (nonzero) digits is 258048, while the sum is 39.

Subtracting 64402620447 from its reverse (74402620446), we obtain a palindrome (9999999999).

The spelling of 64402620447 in words is "sixty-four billion, four hundred two million, six hundred twenty thousand, four hundred forty-seven".