65728191 has 8 divisors (see below), whose sum is σ = 88622640. Its totient is φ = 43326272.

The previous prime is 65728189. The next prime is 65728193. The reversal of 65728191 is 19182756.

It is an interprime number because it is at equal distance from previous prime (65728189) and next prime (65728193).

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 65728191 - 2¹ = 65728189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65728193) 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, 122820 + ... + 123353.

It is an arithmetic number, because the mean of its divisors is an integer number (11077830).

Almost surely, 2^65728191 is an apocalyptic number.

65728191 is a deficient number, since it is larger than the sum of its proper divisors (22894449).

65728191 is a wasteful number, since it uses less digits than its factorization.

65728191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246265.

The product of its digits is 30240, while the sum is 39.

The square root of 65728191 is about 8107.2924580281. The cubic root of 65728191 is about 403.5684683328.

The spelling of 65728191 in words is "sixty-five million, seven hundred twenty-eight thousand, one hundred ninety-one".