65627991 has 24 divisors (see below), whose sum is σ = 111370896. Its totient is φ = 36714240.

The previous prime is 65627971. The next prime is 65627999. The reversal of 65627991 is 19972656.

It is a happy number.

It is not a de Polignac number, because 65627991 - 2¹⁴ = 65611607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65627999) 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 23 ways as a sum of consecutive naturals, for example, 24210 + ... + 26783.

It is an arithmetic number, because the mean of its divisors is an integer number (4640454).

Almost surely, 2^65627991 is an apocalyptic number.

65627991 is a deficient number, since it is larger than the sum of its proper divisors (45742905).

65627991 is a wasteful number, since it uses less digits than its factorization.

65627991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51023 (or 51020 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 65627991 is about 8101.1104794343. The cubic root of 65627991 is about 403.3632893687.

The spelling of 65627991 in words is "sixty-five million, six hundred twenty-seven thousand, nine hundred ninety-one".