65240405 has 4 divisors (see below), whose sum is σ = 78288492. Its totient is φ = 52192320.

The previous prime is 65240381. The next prime is 65240411. The reversal of 65240405 is 50404256.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12909649 + 52330756 = 3593^2 + 7234^2 .

It is not a de Polignac number, because 65240405 - 2¹⁰ = 65239381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6524036 + ... + 6524045.

It is an arithmetic number, because the mean of its divisors is an integer number (19572123).

Almost surely, 2^65240405 is an apocalyptic number.

It is an amenable number.

65240405 is a deficient number, since it is larger than the sum of its proper divisors (13048087).

65240405 is a wasteful number, since it uses less digits than its factorization.

65240405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13048086.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 65240405 is about 8077.1532732764. The cubic root of 65240405 is about 402.5676596262.

The spelling of 65240405 in words is "sixty-five million, two hundred forty thousand, four hundred five".