64087321440 has 96 divisors (see below), whose sum is σ = 210652275456. Its totient is φ = 16346908160.

The previous prime is 64087321387. The next prime is 64087321477. The reversal of 64087321440 is 4412378046.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2891466 + ... + 2913545.

It is an arithmetic number, because the mean of its divisors is an integer number (2194294536).

Almost surely, 2^64087321440 is an apocalyptic number.

64087321440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64087321440 is an abundant number, since it is smaller than the sum of its proper divisors (146564954016).

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

64087321440 is a wasteful number, since it uses less digits than its factorization.

64087321440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5805052 (or 5805044 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

Adding to 64087321440 its reverse (4412378046), we get a palindrome (68499699486).

The spelling of 64087321440 in words is "sixty-four billion, eighty-seven million, three hundred twenty-one thousand, four hundred forty".