64821135 has 16 divisors (see below), whose sum is σ = 104685696. Its totient is φ = 34247328.

The previous prime is 64821079. The next prime is 64821137. The reversal of 64821135 is 53112846.

It is not a de Polignac number, because 64821135 - 2¹⁰ = 64820111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64821137) 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 15 ways as a sum of consecutive naturals, for example, 18589 + ... + 21798.

It is an arithmetic number, because the mean of its divisors is an integer number (6542856).

Almost surely, 2^64821135 is an apocalyptic number.

64821135 is a deficient number, since it is larger than the sum of its proper divisors (39864561).

64821135 is a wasteful number, since it uses less digits than its factorization.

64821135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40502.

The product of its digits is 5760, while the sum is 30.

The square root of 64821135 is about 8051.1573702170. The cubic root of 64821135 is about 401.7034334057.

The spelling of 64821135 in words is "sixty-four million, eight hundred twenty-one thousand, one hundred thirty-five".