64485831 has 4 divisors (see below), whose sum is σ = 85981112. Its totient is φ = 42990552.

The previous prime is 64485809. The next prime is 64485851. The reversal of 64485831 is 13858446.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64485831 - 2⁹ = 64485319 is a prime.

It is a super-3 number, since 3×64485831³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64485831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64485851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10747636 + ... + 10747641.

It is an arithmetic number, because the mean of its divisors is an integer number (21495278).

Almost surely, 2^64485831 is an apocalyptic number.

64485831 is a deficient number, since it is larger than the sum of its proper divisors (21495281).

64485831 is a wasteful number, since it uses less digits than its factorization.

64485831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21495280.

The product of its digits is 92160, while the sum is 39.

The square root of 64485831 is about 8030.3070302449. The cubic root of 64485831 is about 401.0095975547.

The spelling of 64485831 in words is "sixty-four million, four hundred eighty-five thousand, eight hundred thirty-one".