65620405 has 4 divisors (see below), whose sum is σ = 78744492. Its totient is φ = 52496320.

The previous prime is 65620393. The next prime is 65620421. The reversal of 65620405 is 50402656.

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 37136836 + 28483569 = 6094^2 + 5337^2 .

It is not a de Polignac number, because 65620405 - 2⁹ = 65619893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6562036 + ... + 6562045.

It is an arithmetic number, because the mean of its divisors is an integer number (19686123).

Almost surely, 2^65620405 is an apocalyptic number.

It is an amenable number.

65620405 is a deficient number, since it is larger than the sum of its proper divisors (13124087).

65620405 is a wasteful number, since it uses less digits than its factorization.

65620405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13124086.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 65620405 is about 8100.6422584879. The cubic root of 65620405 is about 403.3477470583.

The spelling of 65620405 in words is "sixty-five million, six hundred twenty thousand, four hundred five".