63677681 has 8 divisors (see below), whose sum is σ = 64902144. Its totient is φ = 62462880.

The previous prime is 63677651. The next prime is 63677693. The reversal of 63677681 is 18677636.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63677681 - 2⁶ = 63677617 is a prime.

It is a super-2 number, since 2×63677681² = 8109694115075522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63677611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11660 + ... + 16226.

It is an arithmetic number, because the mean of its divisors is an integer number (8112768).

Almost surely, 2^63677681 is an apocalyptic number.

It is an amenable number.

63677681 is a deficient number, since it is larger than the sum of its proper divisors (1224463).

63677681 is a wasteful number, since it uses less digits than its factorization.

63677681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4831.

The product of its digits is 254016, while the sum is 44.

The square root of 63677681 is about 7979.8296347729. The cubic root of 63677681 is about 399.3273716451.

The spelling of 63677681 in words is "sixty-three million, six hundred seventy-seven thousand, six hundred eighty-one".