65409720 has 64 divisors (see below), whose sum is σ = 196866720. Its totient is φ = 17385984.

The previous prime is 65409697. The next prime is 65409731. The reversal of 65409720 is 2790456.

65409720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46954 + ... + 48326.

Almost surely, 2^65409720 is an apocalyptic number.

65409720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65409720 is an abundant number, since it is smaller than the sum of its proper divisors (131457000).

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

65409720 is a wasteful number, since it uses less digits than its factorization.

65409720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784 (or 1780 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 65409720 is about 8087.6275878653. The cubic root of 65409720 is about 402.9156130328.

The spelling of 65409720 in words is "sixty-five million, four hundred nine thousand, seven hundred twenty".