64884820 has 144 divisors (see below), whose sum is σ = 186617088. Its totient is φ = 18627840.

The previous prime is 64884797. The next prime is 64884823. The reversal of 64884820 is 2848846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64884823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139909 + ... + 140371.

It is an arithmetic number, because the mean of its divisors is an integer number (1295952).

Almost surely, 2^64884820 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 64884820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93308544).

64884820 is an abundant number, since it is smaller than the sum of its proper divisors (121732268).

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

64884820 is a wasteful number, since it uses less digits than its factorization.

64884820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 64884820 is about 8055.1114207067. Note that the first 3 decimals coincide. The cubic root of 64884820 is about 401.8349445746.

The spelling of 64884820 in words is "sixty-four million, eight hundred eighty-four thousand, eight hundred twenty".