64460142640 has 80 divisors (see below), whose sum is σ = 154870087680. Its totient is φ = 24925582080.

The previous prime is 64460142623. The next prime is 64460142647. The reversal of 64460142640 is 4624106446.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 64460142640.

It is not an unprimeable number, because it can be changed into a prime (64460142647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2384721 + ... + 2411599.

It is an arithmetic number, because the mean of its divisors is an integer number (1935876096).

Almost surely, 2^64460142640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64460142640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77435043840).

64460142640 is an abundant number, since it is smaller than the sum of its proper divisors (90409945040).

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

64460142640 is a wasteful number, since it uses less digits than its factorization.

64460142640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27890 (or 27884 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

It can be divided in two parts, 644601 and 42640, that added together give a square (687241 = 829²).

The spelling of 64460142640 in words is "sixty-four billion, four hundred sixty million, one hundred forty-two thousand, six hundred forty".