65139650 has 48 divisors (see below), whose sum is σ = 126313344. Its totient is φ = 24972480.

The previous prime is 65139629. The next prime is 65139653. The reversal of 65139650 is 5693156.

It is a self number, because there is not a number n which added to its sum of digits gives 65139650.

It is not an unprimeable number, because it can be changed into a prime (65139653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124289 + ... + 124811.

It is an arithmetic number, because the mean of its divisors is an integer number (2631528).

Almost surely, 2^65139650 is an apocalyptic number.

65139650 is a deficient number, since it is larger than the sum of its proper divisors (61173694).

65139650 is a wasteful number, since it uses less digits than its factorization.

65139650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 65139650 is about 8070.9138268228. The cubic root of 65139650 is about 402.3603157128.

The spelling of 65139650 in words is "sixty-five million, one hundred thirty-nine thousand, six hundred fifty".