64720501 has 4 divisors (see below), whose sum is σ = 64808352. Its totient is φ = 64632652.

The previous prime is 64720471. The next prime is 64720531. The reversal of 64720501 is 10502746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (64720471) and next prime (64720531).

It is a cyclic number.

It is not a de Polignac number, because 64720501 - 2¹¹ = 64718453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64720531) 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 3 ways as a sum of consecutive naturals, for example, 42811 + ... + 44296.

It is an arithmetic number, because the mean of its divisors is an integer number (16202088).

Almost surely, 2^64720501 is an apocalyptic number.

It is an amenable number.

64720501 is a deficient number, since it is larger than the sum of its proper divisors (87851).

64720501 is an equidigital number, since it uses as much as digits as its factorization.

64720501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87850.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 64720501 is about 8044.9052822268. The cubic root of 64720501 is about 401.4954458866.

The spelling of 64720501 in words is "sixty-four million, seven hundred twenty thousand, five hundred one".