65653440 has 56 divisors (see below), whose sum is σ = 208452720. Its totient is φ = 17507328.

The previous prime is 65653421. The next prime is 65653457. The reversal of 65653440 is 4435656.

65653440 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 7 ways as a sum of consecutive naturals, for example, 33235 + ... + 35154.

It is an arithmetic number, because the mean of its divisors is an integer number (3722370).

Almost surely, 2^65653440 is an apocalyptic number.

65653440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65653440 is an abundant number, since it is smaller than the sum of its proper divisors (142799280).

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

65653440 is a wasteful number, since it uses less digits than its factorization.

65653440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68409 (or 68399 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 65653440 is about 8102.6810377800. The cubic root of 65653440 is about 403.4154209141.

The spelling of 65653440 in words is "sixty-five million, six hundred fifty-three thousand, four hundred forty".