64671632 has 10 divisors (see below), whose sum is σ = 125301318. Its totient is φ = 32335808.

The previous prime is 64671631. The next prime is 64671643. The reversal of 64671632 is 23617646.

It can be written as a sum of positive squares in only one way, i.e., 49336576 + 15335056 = 7024^2 + 3916^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64671592 and 64671601.

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 as a sum of consecutive naturals, namely, 2020973 + ... + 2021004.

Almost surely, 2^64671632 is an apocalyptic number.

It is an amenable number.

64671632 is a deficient number, since it is larger than the sum of its proper divisors (60629686).

64671632 is a wasteful number, since it uses less digits than its factorization.

64671632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041985 (or 4041979 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 64671632 is about 8041.8674448165. The cubic root of 64671632 is about 401.3943670368.

The spelling of 64671632 in words is "sixty-four million, six hundred seventy-one thousand, six hundred thirty-two".