64231505 has 16 divisors (see below), whose sum is σ = 83220480. Its totient is φ = 47310528.

The previous prime is 64231501. The next prime is 64231507. The reversal of 64231505 is 50513246.

It is a cyclic number.

It is not a de Polignac number, because 64231505 - 2² = 64231501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64231501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30104 + ... + 32166.

It is an arithmetic number, because the mean of its divisors is an integer number (5201280).

Almost surely, 2^64231505 is an apocalyptic number.

64231505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64231505 is a deficient number, since it is larger than the sum of its proper divisors (18988975).

64231505 is a wasteful number, since it uses less digits than its factorization.

64231505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560.

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

The square root of 64231505 is about 8014.4560015013. The cubic root of 64231505 is about 400.4817217109.

The spelling of 64231505 in words is "sixty-four million, two hundred thirty-one thousand, five hundred five".