64544340 has 96 divisors (see below), whose sum is σ = 207728640. Its totient is φ = 14668416.

The previous prime is 64544339. The next prime is 64544351. The reversal of 64544340 is 4344546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64544298 and 64544307.

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, 100059 + ... + 100701.

It is an arithmetic number, because the mean of its divisors is an integer number (2163840).

Almost surely, 2^64544340 is an apocalyptic number.

64544340 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 64544340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103864320).

64544340 is an abundant number, since it is smaller than the sum of its proper divisors (143184300).

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

64544340 is a wasteful number, since it uses less digits than its factorization.

64544340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 64544340 is about 8033.9492156722. The cubic root of 64544340 is about 401.1308416468.

Adding to 64544340 its reverse (4344546), we get a palindrome (68888886).

The spelling of 64544340 in words is "sixty-four million, five hundred forty-four thousand, three hundred forty".