65129879 has 4 divisors (see below), whose sum is σ = 66890184. Its totient is φ = 63369576.

The previous prime is 65129863. The next prime is 65129893. The reversal of 65129879 is 97892156.

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 65129879 - 2⁴ = 65129863 is a prime.

It is a super-2 number, since 2×65129879² = 8483802277109282, 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 (65129809) 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, 880097 + ... + 880170.

It is an arithmetic number, because the mean of its divisors is an integer number (16722546).

Almost surely, 2^65129879 is an apocalyptic number.

65129879 is a deficient number, since it is larger than the sum of its proper divisors (1760305).

65129879 is a wasteful number, since it uses less digits than its factorization.

65129879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760304.

The product of its digits is 272160, while the sum is 47.

The square root of 65129879 is about 8070.3084823320. The cubic root of 65129879 is about 402.3401965829.

The spelling of 65129879 in words is "sixty-five million, one hundred twenty-nine thousand, eight hundred seventy-nine".