65479891 has 4 divisors (see below), whose sum is σ = 65534400. Its totient is φ = 65425384.

The previous prime is 65479889. The next prime is 65479943. The reversal of 65479891 is 19897456.

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

It is a cyclic number.

It is not a de Polignac number, because 65479891 - 2¹ = 65479889 is a prime.

It is a super-2 number, since 2×65479891² = 8575232250743762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65479831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25411 + ... + 27868.

It is an arithmetic number, because the mean of its divisors is an integer number (16383600).

Almost surely, 2^65479891 is an apocalyptic number.

65479891 is a deficient number, since it is larger than the sum of its proper divisors (54509).

65479891 is a wasteful number, since it uses less digits than its factorization.

65479891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54508.

The product of its digits is 544320, while the sum is 49.

The square root of 65479891 is about 8091.9645945839. The cubic root of 65479891 is about 403.0596430391.

The spelling of 65479891 in words is "sixty-five million, four hundred seventy-nine thousand, eight hundred ninety-one".