64722768 has 80 divisors (see below), whose sum is σ = 187386816. Its totient is φ = 19077120.

The previous prime is 64722767. The next prime is 64722781. The reversal of 64722768 is 86722746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64722767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17880 + ... + 21192.

Almost surely, 2^64722768 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 64722768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93693408).

64722768 is an abundant number, since it is smaller than the sum of its proper divisors (122664048).

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

64722768 is a wasteful number, since it uses less digits than its factorization.

64722768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372 (or 3366 counting only the distinct ones).

The product of its digits is 225792, while the sum is 42.

The square root of 64722768 is about 8045.0461776176. The cubic root of 64722768 is about 401.5001336313.

The spelling of 64722768 in words is "sixty-four million, seven hundred twenty-two thousand, seven hundred sixty-eight".