64489040 has 240 divisors, whose sum is σ = 204094080. Its totient is φ = 18385920.

The previous prime is 64489031. The next prime is 64489063. The reversal of 64489040 is 4098446.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2223746 + ... + 2223774.

It is an arithmetic number, because the mean of its divisors is an integer number (850392).

Almost surely, 2^64489040 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 64489040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102047040).

64489040 is an abundant number, since it is smaller than the sum of its proper divisors (139605040).

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

64489040 is a wasteful number, since it uses less digits than its factorization.

64489040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 64489040 is about 8030.5068333200. The cubic root of 64489040 is about 401.0162492405.

The spelling of 64489040 in words is "sixty-four million, four hundred eighty-nine thousand, forty".