65728819 has 8 divisors (see below), whose sum is σ = 73226160. Its totient is φ = 58580256.

The previous prime is 65728801. The next prime is 65728837. The reversal of 65728819 is 91882756.

It is an interprime number because it is at equal distance from previous prime (65728801) and next prime (65728837).

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 65728819 - 2⁵ = 65728787 is a prime.

It is a super-2 number, since 2×65728819² = 8640555294269522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65725819) 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, 86797 + ... + 87550.

It is an arithmetic number, because the mean of its divisors is an integer number (9153270).

Almost surely, 2^65728819 is an apocalyptic number.

65728819 is a deficient number, since it is larger than the sum of its proper divisors (7497341).

65728819 is a wasteful number, since it uses less digits than its factorization.

65728819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174389.

The product of its digits is 241920, while the sum is 46.

The square root of 65728819 is about 8107.3311884985. The cubic root of 65728819 is about 403.5697536270.

The spelling of 65728819 in words is "sixty-five million, seven hundred twenty-eight thousand, eight hundred nineteen".