64458240 has 320 divisors, whose sum is σ = 259269120. Its totient is φ = 13271040.

The previous prime is 64458227. The next prime is 64458257. The reversal of 64458240 is 4285446.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 591306 + ... + 591414.

It is an arithmetic number, because the mean of its divisors is an integer number (810216).

Almost surely, 2^64458240 is an apocalyptic number.

64458240 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 64458240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129634560).

64458240 is an abundant number, since it is smaller than the sum of its proper divisors (194810880).

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

64458240 is a wasteful number, since it uses less digits than its factorization.

64458240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 64458240 is about 8028.5889171136. The cubic root of 64458240 is about 400.9523972158.

The spelling of 64458240 in words is "sixty-four million, four hundred fifty-eight thousand, two hundred forty".