64090440 has 160 divisors (see below), whose sum is σ = 218496960. Its totient is φ = 16848000.

The previous prime is 64090427. The next prime is 64090441. The reversal of 64090440 is 4409046.

64090440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (64090441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 424365 + ... + 424515.

It is an arithmetic number, because the mean of its divisors is an integer number (1365606).

Almost surely, 2^64090440 is an apocalyptic number.

64090440 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 64090440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109248480).

64090440 is an abundant number, since it is smaller than the sum of its proper divisors (154406520).

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

64090440 is a wasteful number, since it uses less digits than its factorization.

64090440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 64090440 is about 8005.6505044874. The cubic root of 64090440 is about 400.1883279842.

Adding to 64090440 its reverse (4409046), we get a palindrome (68499486).

The spelling of 64090440 in words is "sixty-four million, ninety thousand, four hundred forty".