65405405 has 8 divisors (see below), whose sum is σ = 84523992. Its totient is φ = 48299328.

The previous prime is 65405401. The next prime is 65405407. The reversal of 65405405 is 50450456.

It can be written as a sum of positive squares in 4 ways, for example, as 151321 + 65254084 = 389^2 + 8078^2 .

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 65405405 - 2² = 65405401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65405401) 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, 503054 + ... + 503183.

It is an arithmetic number, because the mean of its divisors is an integer number (10565499).

Almost surely, 2^65405405 is an apocalyptic number.

65405405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65405405 is a deficient number, since it is larger than the sum of its proper divisors (19118587).

65405405 is a wasteful number, since it uses less digits than its factorization.

65405405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006255.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 65405405 is about 8087.3608179678. The cubic root of 65405405 is about 402.9067528863.

The spelling of 65405405 in words is "sixty-five million, four hundred five thousand, four hundred five".