64623817140 has 96 divisors (see below), whose sum is σ = 188901974016. Its totient is φ = 16476071040.

The previous prime is 64623817133. The next prime is 64623817169. The reversal of 64623817140 is 4171832646.

64623817140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64623817092 and 64623817101.

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, 3317469 + ... + 3336891.

It is an arithmetic number, because the mean of its divisors is an integer number (1967728896).

Almost surely, 2^64623817140 is an apocalyptic number.

64623817140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64623817140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94450987008).

64623817140 is an abundant number, since it is smaller than the sum of its proper divisors (124278156876).

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

64623817140 is a wasteful number, since it uses less digits than its factorization.

64623817140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21869 (or 21867 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 64623817140 in words is "sixty-four billion, six hundred twenty-three million, eight hundred seventeen thousand, one hundred forty".