64981216 has 24 divisors (see below), whose sum is σ = 134666280. Its totient is φ = 30780288.

The previous prime is 64981211. The next prime is 64981237. The reversal of 64981216 is 61218946.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64981211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52831 + ... + 54046.

It is an arithmetic number, because the mean of its divisors is an integer number (5611095).

Almost surely, 2^64981216 is an apocalyptic number.

It is an amenable number.

64981216 is an abundant number, since it is smaller than the sum of its proper divisors (69685064).

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

64981216 is a wasteful number, since it uses less digits than its factorization.

64981216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106906 (or 106898 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 64981216 is about 8061.0927298971. The cubic root of 64981216 is about 402.0338411979.

The spelling of 64981216 in words is "sixty-four million, nine hundred eighty-one thousand, two hundred sixteen".