65691128 has 32 divisors (see below), whose sum is σ = 136092960. Its totient is φ = 29568000.

The previous prime is 65691121. The next prime is 65691133. The reversal of 65691128 is 82119656.

It is a junction number, because it is equal to n+sod(n) for n = 65691091 and 65691100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65691121) 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 7 ways as a sum of consecutive naturals, for example, 7373 + ... + 13628.

It is an arithmetic number, because the mean of its divisors is an integer number (4252905).

Almost surely, 2^65691128 is an apocalyptic number.

65691128 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65691128 is an abundant number, since it is smaller than the sum of its proper divisors (70401832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65691128 is a wasteful number, since it uses less digits than its factorization.

65691128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21047 (or 21043 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 65691128 is about 8105.0063540999. The cubic root of 65691128 is about 403.4925989572.

The spelling of 65691128 in words is "sixty-five million, six hundred ninety-one thousand, one hundred twenty-eight".