64354532440 has 96 divisors (see below), whose sum is σ = 159270809040. Its totient is φ = 23385035520.

The previous prime is 64354532413. The next prime is 64354532447. The reversal of 64354532440 is 4423545346.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64354532393 and 64354532402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64354532447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8335462 + ... + 8343178.

Almost surely, 2^64354532440 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 64354532440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79635404520).

64354532440 is an abundant number, since it is smaller than the sum of its proper divisors (94916276600).

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

64354532440 is a wasteful number, since it uses less digits than its factorization.

64354532440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473 (or 9458 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 40.

The spelling of 64354532440 in words is "sixty-four billion, three hundred fifty-four million, five hundred thirty-two thousand, four hundred forty".