64720663 has 16 divisors (see below), whose sum is σ = 76930560. Its totient is φ = 53272800.

The previous prime is 64720657. The next prime is 64720687. The reversal of 64720663 is 36602746.

It is not a de Polignac number, because 64720663 - 2⁹ = 64720151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64726663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42078 + ... + 43588.

It is an arithmetic number, because the mean of its divisors is an integer number (4808160).

Almost surely, 2^64720663 is an apocalyptic number.

64720663 is a deficient number, since it is larger than the sum of its proper divisors (12209897).

64720663 is a wasteful number, since it uses less digits than its factorization.

64720663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 64720663 is about 8044.9153507044. The cubic root of 64720663 is about 401.4957808768.

The spelling of 64720663 in words is "sixty-four million, seven hundred twenty thousand, six hundred sixty-three".