64738756540 has 24 divisors (see below), whose sum is σ = 138255652080. Its totient is φ = 25456595328.

The previous prime is 64738756529. The next prime is 64738756543. The reversal of 64738756540 is 4565783746.

It is a super-2 number, since 2×64738756540² (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 (64738756543) 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, 27430497 + ... + 27432856.

It is an arithmetic number, because the mean of its divisors is an integer number (5760652170).

Almost surely, 2^64738756540 is an apocalyptic number.

It is an amenable number.

64738756540 is an abundant number, since it is smaller than the sum of its proper divisors (73516895540).

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

64738756540 is a wasteful number, since it uses less digits than its factorization.

64738756540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54863421 (or 54863419 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 55.

The spelling of 64738756540 in words is "sixty-four billion, seven hundred thirty-eight million, seven hundred fifty-six thousand, five hundred forty".