64538880 has 216 divisors, whose sum is σ = 240472512. Its totient is φ = 14751744.

The previous prime is 64538867. The next prime is 64538917. The reversal of 64538880 is 8883546.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9219837 + ... + 9219843.

Almost surely, 2^64538880 is an apocalyptic number.

64538880 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 64538880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120236256).

64538880 is an abundant number, since it is smaller than the sum of its proper divisors (175933632).

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

64538880 is an frugal number, since it uses more digits than its factorization.

64538880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 64538880 is about 8033.6094005123. The cubic root of 64538880 is about 401.1195303728.

The spelling of 64538880 in words is "sixty-four million, five hundred thirty-eight thousand, eight hundred eighty".