64489920 has 224 divisors, whose sum is σ = 231745536. Its totient is φ = 15052800.

The previous prime is 64489903. The next prime is 64489937. The reversal of 64489920 is 2998446.

It is an interprime number because it is at equal distance from previous prime (64489903) and next prime (64489937).

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, 327262 + ... + 327458.

Almost surely, 2^64489920 is an apocalyptic number.

64489920 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 64489920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115872768).

64489920 is an abundant number, since it is smaller than the sum of its proper divisors (167255616).

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

64489920 is a wasteful number, since it uses less digits than its factorization.

64489920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 64489920 is about 8030.5616241954. The cubic root of 64489920 is about 401.0180732853.

It can be divided in two parts, 64 and 489920, that added together give a palindrome (489984).

The spelling of 64489920 in words is "sixty-four million, four hundred eighty-nine thousand, nine hundred twenty".