64123505 has 8 divisors (see below), whose sum is σ = 78210024. Its totient is φ = 50457600.

The previous prime is 64123487. The next prime is 64123513. The reversal of 64123505 is 50532146.

It can be written as a sum of positive squares in 4 ways, for example, as 1032256 + 63091249 = 1016^2 + 7943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64123505 - 2⁸ = 64123249 is a prime.

It is a super-2 number, since 2×64123505² = 8223647786970050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104816 + ... + 105425.

It is an arithmetic number, because the mean of its divisors is an integer number (9776253).

Almost surely, 2^64123505 is an apocalyptic number.

It is an amenable number.

64123505 is a deficient number, since it is larger than the sum of its proper divisors (14086519).

64123505 is a wasteful number, since it uses less digits than its factorization.

64123505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210307.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 64123505 is about 8007.7153420935. The cubic root of 64123505 is about 400.2571367496.

The spelling of 64123505 in words is "sixty-four million, one hundred twenty-three thousand, five hundred five".