65421636 has 96 divisors (see below), whose sum is σ = 185472000. Its totient is φ = 17532288.

The previous prime is 65421623. The next prime is 65421641. The reversal of 65421636 is 63612456.

It is a junction number, because it is equal to n+sod(n) for n = 65421597 and 65421606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285570 + ... + 285798.

It is an arithmetic number, because the mean of its divisors is an integer number (1932000).

Almost surely, 2^65421636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65421636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92736000).

65421636 is an abundant number, since it is smaller than the sum of its proper divisors (120050364).

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

65421636 is a wasteful number, since it uses less digits than its factorization.

65421636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 439 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 65421636 is about 8088.3642351220. The cubic root of 65421636 is about 402.9400785654.

The spelling of 65421636 in words is "sixty-five million, four hundred twenty-one thousand, six hundred thirty-six".