64441390540 has 24 divisors (see below), whose sum is σ = 135695673792. Its totient is φ = 25706317440.

The previous prime is 64441390537. The next prime is 64441390583. The reversal of 64441390540 is 4509314446.

It is a junction number, because it is equal to n+sod(n) for n = 64441390493 and 64441390502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4382401 + ... + 4397080.

It is an arithmetic number, because the mean of its divisors is an integer number (5653986408).

Almost surely, 2^64441390540 is an apocalyptic number.

It is an amenable number.

64441390540 is an abundant number, since it is smaller than the sum of its proper divisors (71254283252).

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

64441390540 is a wasteful number, since it uses less digits than its factorization.

64441390540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8779857 (or 8779855 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 64441390540 in words is "sixty-four billion, four hundred forty-one million, three hundred ninety thousand, five hundred forty".