64503261 has 6 divisors (see below), whose sum is σ = 93171390. Its totient is φ = 43002168.

The previous prime is 64503251. The next prime is 64503277. The reversal of 64503261 is 16230546.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 25190361 = 6270^2 + 5019^2 .

It is not a de Polignac number, because 64503261 - 2⁷ = 64503133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64503251) 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 5 ways as a sum of consecutive naturals, for example, 3583506 + ... + 3583523.

It is an arithmetic number, because the mean of its divisors is an integer number (15528565).

Almost surely, 2^64503261 is an apocalyptic number.

It is an amenable number.

64503261 is a deficient number, since it is larger than the sum of its proper divisors (28668129).

64503261 is a wasteful number, since it uses less digits than its factorization.

64503261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167035 (or 7167032 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 64503261 is about 8031.3922205306. The cubic root of 64503261 is about 401.0457241866.

The spelling of 64503261 in words is "sixty-four million, five hundred three thousand, two hundred sixty-one".