64645787910 has 192 divisors, whose sum is σ = 180021139200. Its totient is φ = 14804824320.

The previous prime is 64645787897. The next prime is 64645787933. The reversal of 64645787910 is 1978754646.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28897312 + ... + 28899548.

It is an arithmetic number, because the mean of its divisors is an integer number (937610100).

Almost surely, 2^64645787910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64645787910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90010569600).

64645787910 is an abundant number, since it is smaller than the sum of its proper divisors (115375351290).

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

64645787910 is a wasteful number, since it uses less digits than its factorization.

64645787910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707 (or 2696 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 64645787910 in words is "sixty-four billion, six hundred forty-five million, seven hundred eighty-seven thousand, nine hundred ten".