63671881 has 16 divisors (see below), whose sum is σ = 78624000. Its totient is φ = 50211648.

The previous prime is 63671879. The next prime is 63671891. The reversal of 63671881 is 18817636.

It is a cyclic number.

It is not a de Polignac number, because 63671881 - 2¹ = 63671879 is a prime.

It is a super-2 number, since 2×63671881² = 8108216860156322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63671801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31695 + ... + 33643.

It is an arithmetic number, because the mean of its divisors is an integer number (4914000).

Almost surely, 2^63671881 is an apocalyptic number.

It is an amenable number.

63671881 is a deficient number, since it is larger than the sum of its proper divisors (14952119).

63671881 is a wasteful number, since it uses less digits than its factorization.

63671881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328.

The product of its digits is 48384, while the sum is 40.

The square root of 63671881 is about 7979.4662102173. The cubic root of 63671881 is about 399.3152472029.

The spelling of 63671881 in words is "sixty-three million, six hundred seventy-one thousand, eight hundred eighty-one".