65672891 has 8 divisors (see below), whose sum is σ = 67602000. Its totient is φ = 63751968.

The previous prime is 65672851. The next prime is 65672899. The reversal of 65672891 is 19827656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65672891 is a prime.

It is a super-2 number, since 2×65672891² = 8625857224595762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65672899) 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, 16685 + ... + 20241.

It is an arithmetic number, because the mean of its divisors is an integer number (8450250).

Almost surely, 2^65672891 is an apocalyptic number.

65672891 is a deficient number, since it is larger than the sum of its proper divisors (1929109).

65672891 is a wasteful number, since it uses less digits than its factorization.

65672891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4093.

The product of its digits is 181440, while the sum is 44.

The square root of 65672891 is about 8103.8812306203. The cubic root of 65672891 is about 403.4552566462.

The spelling of 65672891 in words is "sixty-five million, six hundred seventy-two thousand, eight hundred ninety-one".