64434240340 has 24 divisors (see below), whose sum is σ = 135516640392. Its totient is φ = 25734698880.

The previous prime is 64434240337. The next prime is 64434240349. The reversal of 64434240340 is 4304243446.

It can be written as a sum of positive squares in 4 ways, for example, as 4962638916 + 59471601424 = 70446^2 + 243868^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64434240296 and 64434240305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64434240349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2423779 + ... + 2450218.

It is an arithmetic number, because the mean of its divisors is an integer number (5646526683).

Almost surely, 2^64434240340 is an apocalyptic number.

It is an amenable number.

64434240340 is an abundant number, since it is smaller than the sum of its proper divisors (71082400052).

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

64434240340 is a wasteful number, since it uses less digits than its factorization.

64434240340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874667 (or 4874665 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 34.

Adding to 64434240340 its reverse (4304243446), we get a palindrome (68738483786).

The spelling of 64434240340 in words is "sixty-four billion, four hundred thirty-four million, two hundred forty thousand, three hundred forty".