64521912 has 128 divisors (see below), whose sum is σ = 205148160. Its totient is φ = 16450560.

The previous prime is 64521911. The next prime is 64521937. The reversal of 64521912 is 21912546.

64521912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 64521912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64521911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67228 + ... + 68180.

It is an arithmetic number, because the mean of its divisors is an integer number (1602720).

Almost surely, 2^64521912 is an apocalyptic number.

64521912 is a gapful number since it is divisible by the number (62) 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 64521912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102574080).

64521912 is an abundant number, since it is smaller than the sum of its proper divisors (140626248).

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

64521912 is a wasteful number, since it uses less digits than its factorization.

64521912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1009 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 64521912 is about 8032.5532677972. The cubic root of 64521912 is about 401.0843743410.

The spelling of 64521912 in words is "sixty-four million, five hundred twenty-one thousand, nine hundred twelve".