129565864 has 48 divisors (see below), whose sum is σ = 264535200. Its totient is φ = 59326560.

The previous prime is 129565861. The next prime is 129565871. The reversal of 129565864 is 468565921.

It is a super-2 number, since 2×129565864² = 33574626228132992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129565861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145629 + ... + 146515.

It is an arithmetic number, because the mean of its divisors is an integer number (5511150).

Almost surely, 2^129565864 is an apocalyptic number.

It is an amenable number.

129565864 is an abundant number, since it is smaller than the sum of its proper divisors (134969336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129565864 is a wasteful number, since it uses less digits than its factorization.

129565864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974 (or 939 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The square root of 129565864 is about 11382.7002068929. The cubic root of 129565864 is about 506.0151640797.

The spelling of 129565864 in words is "one hundred twenty-nine million, five hundred sixty-five thousand, eight hundred sixty-four".