65653638 has 16 divisors (see below), whose sum is σ = 137016576. Its totient is φ = 20933000.

The previous prime is 65653633. The next prime is 65653639. The reversal of 65653638 is 83635656.

It is a self number, because there is not a number n which added to its sum of digits gives 65653638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65653631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237738 + ... + 238013.

It is an arithmetic number, because the mean of its divisors is an integer number (8563536).

Almost surely, 2^65653638 is an apocalyptic number.

65653638 is an abundant number, since it is smaller than the sum of its proper divisors (71362938).

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

65653638 is a wasteful number, since it uses less digits than its factorization.

65653638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475779.

The product of its digits is 388800, while the sum is 42.

The square root of 65653638 is about 8102.6932559489. The cubic root of 65653638 is about 403.4158264586.

The spelling of 65653638 in words is "sixty-five million, six hundred fifty-three thousand, six hundred thirty-eight".