64749906487 has 12 divisors (see below), whose sum is σ = 75368991456. Its totient is φ = 55464793440.

The previous prime is 64749906461. The next prime is 64749906509. The reversal of 64749906487 is 78460994746.

It is a de Polignac number, because none of the positive numbers 2^k-64749906487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64749906437) 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 11 ways as a sum of consecutive naturals, for example, 339814 + ... + 494947.

It is an arithmetic number, because the mean of its divisors is an integer number (6280749288).

Almost surely, 2^64749906487 is an apocalyptic number.

64749906487 is a deficient number, since it is larger than the sum of its proper divisors (10619084969).

64749906487 is a wasteful number, since it uses less digits than its factorization.

64749906487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836358 (or 836351 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 64.

The spelling of 64749906487 in words is "sixty-four billion, seven hundred forty-nine million, nine hundred six thousand, four hundred eighty-seven".