65138847 has 4 divisors (see below), whose sum is σ = 86851800. Its totient is φ = 43425896.

The previous prime is 65138837. The next prime is 65138861. The reversal of 65138847 is 74883156.

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

It is a cyclic number.

It is not a de Polignac number, because 65138847 - 2¹⁰ = 65137823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65138799 and 65138808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65138837) 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, 10856472 + ... + 10856477.

It is an arithmetic number, because the mean of its divisors is an integer number (21712950).

Almost surely, 2^65138847 is an apocalyptic number.

65138847 is a deficient number, since it is larger than the sum of its proper divisors (21712953).

65138847 is a wasteful number, since it uses less digits than its factorization.

65138847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21712952.

The product of its digits is 161280, while the sum is 42.

The square root of 65138847 is about 8070.8640801342. The cubic root of 65138847 is about 402.3586623590.

The spelling of 65138847 in words is "sixty-five million, one hundred thirty-eight thousand, eight hundred forty-seven".