65396550 has 48 divisors (see below), whose sum is σ = 165971520. Its totient is φ = 17031840.

The previous prime is 65396543. The next prime is 65396561. The reversal of 65396550 is 5569356.

It is a junction number, because it is equal to n+sod(n) for n = 65396499 and 65396508.

It is a congruent number.

It is an unprimeable number.

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, 1381 + ... + 11519.

It is an arithmetic number, because the mean of its divisors is an integer number (3457740).

Almost surely, 2^65396550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65396550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82985760).

65396550 is an abundant number, since it is smaller than the sum of its proper divisors (100574970).

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

65396550 is a wasteful number, since it uses less digits than its factorization.

65396550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10197 (or 10192 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 39.

The square root of 65396550 is about 8086.8133402472. The cubic root of 65396550 is about 402.8885693722. Note that the first 3 decimals are identical.

The spelling of 65396550 in words is "sixty-five million, three hundred ninety-six thousand, five hundred fifty".