64436 has 12 divisors (see below), whose sum is σ = 114660. Its totient is φ = 31680.

The previous prime is 64433. The next prime is 64439. The reversal of 64436 is 63446.

It is an interprime number because it is at equal distance from previous prime (64433) and next prime (64439).

It can be written as a sum of positive squares in 2 ways, for example, as 4900 + 59536 = 70^2 + 244^2 .

It is a plaindrome in base 11.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64433) 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 3 ways as a sum of consecutive naturals, for example, 266 + ... + 446.

It is an arithmetic number, because the mean of its divisors is an integer number (9555).

2⁶⁴⁴³⁶ is an apocalyptic number.

It is an amenable number.

64436 is a deficient number, since it is larger than the sum of its proper divisors (50224).

64436 is a wasteful number, since it uses less digits than its factorization.

64436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 272 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 64436 is about 253.8424708358. The cubic root of 64436 is about 40.0906278431.

Subtracting from 64436 its reverse (63446), we obtain a triangular number (990 = T₄₄).

The spelling of 64436 in words is "sixty-four thousand, four hundred thirty-six".