65449820 has 12 divisors (see below), whose sum is σ = 137444664. Its totient is φ = 26179920.

The previous prime is 65449807. The next prime is 65449849. The reversal of 65449820 is 2894456.

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 3 ways as a sum of consecutive naturals, for example, 1636226 + ... + 1636265.

It is an arithmetic number, because the mean of its divisors is an integer number (11453722).

Almost surely, 2^65449820 is an apocalyptic number.

It is an amenable number.

65449820 is an abundant number, since it is smaller than the sum of its proper divisors (71994844).

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

65449820 is a wasteful number, since it uses less digits than its factorization.

65449820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272500 (or 3272498 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 65449820 is about 8090.1063033807. The cubic root of 65449820 is about 402.9979331910.

The spelling of 65449820 in words is "sixty-five million, four hundred forty-nine thousand, eight hundred twenty".