64819760 has 80 divisors (see below), whose sum is σ = 158561280. Its totient is φ = 24610560.

The previous prime is 64819757. The next prime is 64819771. The reversal of 64819760 is 6791846.

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

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, 146099 + ... + 146541.

It is an arithmetic number, because the mean of its divisors is an integer number (1982016).

Almost surely, 2^64819760 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 64819760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79280640).

64819760 is an abundant number, since it is smaller than the sum of its proper divisors (93741520).

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

64819760 is a wasteful number, since it uses less digits than its factorization.

64819760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 64819760 is about 8051.0719783144. The cubic root of 64819760 is about 401.7005930454.

The spelling of 64819760 in words is "sixty-four million, eight hundred nineteen thousand, seven hundred sixty".