63840891 has 16 divisors (see below), whose sum is σ = 86929920. Its totient is φ = 41662560.

The previous prime is 63840877. The next prime is 63840913. The reversal of 63840891 is 19804836.

It is not a de Polignac number, because 63840891 - 2⁵ = 63840859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63840871) 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, 51246 + ... + 52476.

It is an arithmetic number, because the mean of its divisors is an integer number (5433120).

Almost surely, 2^63840891 is an apocalyptic number.

63840891 is a deficient number, since it is larger than the sum of its proper divisors (23089029).

63840891 is a wasteful number, since it uses less digits than its factorization.

63840891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 63840891 is about 7990.0494992209. The cubic root of 63840891 is about 399.6682478440.

The spelling of 63840891 in words is "sixty-three million, eight hundred forty thousand, eight hundred ninety-one".