63891947 has 8 divisors (see below), whose sum is σ = 73702656. Its totient is φ = 54252072.

The previous prime is 63891931. The next prime is 63891991. The reversal of 63891947 is 74919836.

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

It is not a de Polignac number, because 63891947 - 2⁴ = 63891931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63891917) 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, 41903 + ... + 43400.

It is an arithmetic number, because the mean of its divisors is an integer number (9212832).

Almost surely, 2^63891947 is an apocalyptic number.

63891947 is a deficient number, since it is larger than the sum of its proper divisors (9810709).

63891947 is a wasteful number, since it uses less digits than its factorization.

63891947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85417.

The product of its digits is 326592, while the sum is 47.

The square root of 63891947 is about 7993.2438346394. The cubic root of 63891947 is about 399.7747627776.

The spelling of 63891947 in words is "sixty-three million, eight hundred ninety-one thousand, nine hundred forty-seven".