64507501 has 4 divisors (see below), whose sum is σ = 64539904. Its totient is φ = 64475100.

The previous prime is 64507493. The next prime is 64507511. The reversal of 64507501 is 10570546.

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 a cyclic number.

It is not a de Polignac number, because 64507501 - 2³ = 64507493 is a prime.

It is a super-2 number, since 2×64507501² = 8322435370530002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64507501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64507511) 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, 13005 + ... + 17266.

It is an arithmetic number, because the mean of its divisors is an integer number (16134976).

Almost surely, 2^64507501 is an apocalyptic number.

It is an amenable number.

64507501 is a deficient number, since it is larger than the sum of its proper divisors (32403).

64507501 is a wasteful number, since it uses less digits than its factorization.

64507501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32402.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 64507501 is about 8031.6561803902. The cubic root of 64507501 is about 401.0545113217.

The spelling of 64507501 in words is "sixty-four million, five hundred seven thousand, five hundred one".