64081920 has 208 divisors, whose sum is σ = 235900800. Its totient is φ = 14548992.

The previous prime is 64081807. The next prime is 64081937. The reversal of 64081920 is 2918046.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430006 + ... + 430154.

Almost surely, 2^64081920 is an apocalyptic number.

64081920 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 64081920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117950400).

64081920 is an abundant number, since it is smaller than the sum of its proper divisors (171818880).

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

64081920 is a wasteful number, since it uses less digits than its factorization.

64081920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 64081920 is about 8005.1183626477. The cubic root of 64081920 is about 400.1705939006.

Adding to 64081920 its reverse (2918046), we get a palindrome (66999966).

The spelling of 64081920 in words is "sixty-four million, eighty-one thousand, nine hundred twenty".