64631581340 has 48 divisors (see below), whose sum is σ = 136650447360. Its totient is φ = 25677192000.

The previous prime is 64631581307. The next prime is 64631581369. The reversal of 64631581340 is 4318513646.

It is a congruent number.

It is an unprimeable number.

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, 1784249 + ... + 1820111.

It is an arithmetic number, because the mean of its divisors is an integer number (2846884320).

Almost surely, 2^64631581340 is an apocalyptic number.

It is an amenable number.

64631581340 is an abundant number, since it is smaller than the sum of its proper divisors (72018866020).

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

64631581340 is a wasteful number, since it uses less digits than its factorization.

64631581340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36482 (or 36480 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 64631581340 in words is "sixty-four billion, six hundred thirty-one million, five hundred eighty-one thousand, three hundred forty".