63872591 has 4 divisors (see below), whose sum is σ = 64747632. Its totient is φ = 62997552.

The previous prime is 63872581. The next prime is 63872593. The reversal of 63872591 is 19527836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63872591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63872593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437411 + ... + 437556.

It is an arithmetic number, because the mean of its divisors is an integer number (16186908).

Almost surely, 2^63872591 is an apocalyptic number.

63872591 is a deficient number, since it is larger than the sum of its proper divisors (875041).

63872591 is an equidigital number, since it uses as much as digits as its factorization.

63872591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875040.

The product of its digits is 90720, while the sum is 41.

The square root of 63872591 is about 7992.0329704025. The cubic root of 63872591 is about 399.7343882484.

The spelling of 63872591 in words is "sixty-three million, eight hundred seventy-two thousand, five hundred ninety-one".