64138396487 has 8 divisors (see below), whose sum is σ = 70954641792. Its totient is φ = 57486398200.

The previous prime is 64138396423. The next prime is 64138396499. The reversal of 64138396487 is 78469383146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64138396487 - 2⁶ = 64138396423 is a prime.

It is a super-2 number, since 2×64138396487² (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 (64138396687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41060933 + ... + 41062494.

It is an arithmetic number, because the mean of its divisors is an integer number (8869330224).

Almost surely, 2^64138396487 is an apocalyptic number.

64138396487 is a deficient number, since it is larger than the sum of its proper divisors (6816245305).

64138396487 is a wasteful number, since it uses less digits than its factorization.

64138396487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82123509.

The product of its digits is 20901888, while the sum is 59.

The spelling of 64138396487 in words is "sixty-four billion, one hundred thirty-eight million, three hundred ninety-six thousand, four hundred eighty-seven".