65603538 has 144 divisors (see below), whose sum is σ = 192873408. Its totient is φ = 15681600.

The previous prime is 65603537. The next prime is 65603543. The reversal of 65603538 is 83530656.

65603538 is a `hidden beast` number, since 65 + 60 + 3 + 538 = 666.

It is not an unprimeable number, because it can be changed into a prime (65603537) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 198033 + ... + 198363.

Almost surely, 2^65603538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65603538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96436704).

65603538 is an abundant number, since it is smaller than the sum of its proper divisors (127269870).

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

65603538 is a wasteful number, since it uses less digits than its factorization.

65603538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 65603538 is about 8099.6011012889. The cubic root of 65603538 is about 403.3131854031.

The spelling of 65603538 in words is "sixty-five million, six hundred three thousand, five hundred thirty-eight".