64855280 has 80 divisors (see below), whose sum is σ = 173560320. Its totient is φ = 22077696.

The previous prime is 64855277. The next prime is 64855283. The reversal of 64855280 is 8255846.

It is an interprime number because it is at equal distance from previous prime (64855277) and next prime (64855283).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64855283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99917 + ... + 100563.

It is an arithmetic number, because the mean of its divisors is an integer number (2169504).

Almost surely, 2^64855280 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 64855280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86780160).

64855280 is an abundant number, since it is smaller than the sum of its proper divisors (108705040).

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

64855280 is a wasteful number, since it uses less digits than its factorization.

64855280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 64855280 is about 8053.2775936261. The cubic root of 64855280 is about 401.7739544175.

The spelling of 64855280 in words is "sixty-four million, eight hundred fifty-five thousand, two hundred eighty".