64671633 has 12 divisors (see below), whose sum is σ = 100600500. Its totient is φ = 39797856.

The previous prime is 64671631. The next prime is 64671643. The reversal of 64671633 is 33617646.

It is a happy number.

64671633 is a `hidden beast` number, since 646 + 7 + 1 + 6 + 3 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24830289 + 39841344 = 4983^2 + 6312^2 .

It is not a de Polignac number, because 64671633 - 2¹ = 64671631 is a prime.

It is a super-2 number, since 2×64671633² = 8364840229773378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64671631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276258 + ... + 276491.

It is an arithmetic number, because the mean of its divisors is an integer number (8383375).

Almost surely, 2^64671633 is an apocalyptic number.

It is an amenable number.

64671633 is a deficient number, since it is larger than the sum of its proper divisors (35928867).

64671633 is a wasteful number, since it uses less digits than its factorization.

64671633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552768 (or 552765 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 64671633 is about 8041.8675069911. The cubic root of 64671633 is about 401.3943691057.

It can be divided in two parts, 6467 and 1633, that added together give a square (8100 = 90²).

The spelling of 64671633 in words is "sixty-four million, six hundred seventy-one thousand, six hundred thirty-three".