65638379 has 4 divisors (see below), whose sum is σ = 66714480. Its totient is φ = 64562280.

The previous prime is 65638373. The next prime is 65638381. The reversal of 65638379 is 97383656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65638379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65638373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537959 + ... + 538080.

It is an arithmetic number, because the mean of its divisors is an integer number (16678620).

Almost surely, 2^65638379 is an apocalyptic number.

65638379 is a deficient number, since it is larger than the sum of its proper divisors (1076101).

65638379 is a wasteful number, since it uses less digits than its factorization.

65638379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076100.

The product of its digits is 816480, while the sum is 47.

The square root of 65638379 is about 8101.7516007343. The cubic root of 65638379 is about 403.3845705158.

The spelling of 65638379 in words is "sixty-five million, six hundred thirty-eight thousand, three hundred seventy-nine".