64945972 has 72 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 25260480.

The previous prime is 64945957. The next prime is 64945987. The reversal of 64945972 is 27954946.

It is an interprime number because it is at equal distance from previous prime (64945957) and next prime (64945987).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180729 + ... + 181087.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^64945972 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 64945972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72394560).

64945972 is an abundant number, since it is smaller than the sum of its proper divisors (79843148).

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

64945972 is a wasteful number, since it uses less digits than its factorization.

64945972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 452 counting only the distinct ones).

The product of its digits is 544320, while the sum is 46.

The square root of 64945972 is about 8058.9063774187. The cubic root of 64945972 is about 401.9611440708.

The spelling of 64945972 in words is "sixty-four million, nine hundred forty-five thousand, nine hundred seventy-two".