65139869 has 8 divisors (see below), whose sum is σ = 70836408. Its totient is φ = 59650560.

The previous prime is 65139839. The next prime is 65139889. The reversal of 65139869 is 96893156.

It can be written as a sum of positive squares in 4 ways, for example, as 15507844 + 49632025 = 3938^2 + 7045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65139869 - 2²⁴ = 48362653 is a prime.

It is a super-2 number, since 2×65139869² = 8486405066674322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65139839) 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, 51152 + ... + 52409.

It is an arithmetic number, because the mean of its divisors is an integer number (8854551).

Almost surely, 2^65139869 is an apocalyptic number.

It is an amenable number.

65139869 is a deficient number, since it is larger than the sum of its proper divisors (5696539).

65139869 is a wasteful number, since it uses less digits than its factorization.

65139869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103615.

The product of its digits is 349920, while the sum is 47.

The square root of 65139869 is about 8070.9273940483. The cubic root of 65139869 is about 402.3607666251.

The spelling of 65139869 in words is "sixty-five million, one hundred thirty-nine thousand, eight hundred sixty-nine".