64442923536 has 80 divisors (see below), whose sum is σ = 176743759104. Its totient is φ = 20163090432.

The previous prime is 64442923507. The next prime is 64442923541. The reversal of 64442923536 is 63532924446.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 198505 + ... + 410231.

Almost surely, 2^64442923536 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 64442923536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88371879552).

64442923536 is an abundant number, since it is smaller than the sum of its proper divisors (112300835568).

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

64442923536 is a wasteful number, since it uses less digits than its factorization.

64442923536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212128 (or 212122 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 48.

The spelling of 64442923536 in words is "sixty-four billion, four hundred forty-two million, nine hundred twenty-three thousand, five hundred thirty-six".