64710988440 has 128 divisors (see below), whose sum is σ = 229023313920. Its totient is φ = 14313945600.

The previous prime is 64710988423. The next prime is 64710988469. The reversal of 64710988440 is 4488901746.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1216491 + ... + 1268570.

It is an arithmetic number, because the mean of its divisors is an integer number (1789244640).

Almost surely, 2^64710988440 is an apocalyptic number.

64710988440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64710988440 is an abundant number, since it is smaller than the sum of its proper divisors (164312325480).

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

64710988440 is a wasteful number, since it uses less digits than its factorization.

64710988440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2485113 (or 2485109 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 64710988440 in words is "sixty-four billion, seven hundred ten million, nine hundred eighty-eight thousand, four hundred forty".