65649120 has 48 divisors (see below), whose sum is σ = 206796240. Its totient is φ = 17506304.

The previous prime is 65649113. The next prime is 65649151. The reversal of 65649120 is 2194656.

Added to its reverse (2194656) it gives a triangular number (67843776 = T₁₁₆₄₈).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67905 + ... + 68864.

It is an arithmetic number, because the mean of its divisors is an integer number (4308255).

Almost surely, 2^65649120 is an apocalyptic number.

65649120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65649120 is an abundant number, since it is smaller than the sum of its proper divisors (141147120).

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

65649120 is a wasteful number, since it uses less digits than its factorization.

65649120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136787 (or 136779 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 65649120 is about 8102.4144549634. The cubic root of 65649120 is about 403.4065724676.

Adding to 65649120 its reverse (2194656), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 65649120 in words is "sixty-five million, six hundred forty-nine thousand, one hundred twenty".