65780426 has 4 divisors (see below), whose sum is σ = 98670642. Its totient is φ = 32890212.

The previous prime is 65780423. The next prime is 65780431. The reversal of 65780426 is 62408756.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 89401 = 8105^2 + 299^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65780426.

It is not an unprimeable number, because it can be changed into a prime (65780423) by changing a digit.

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 as a sum of consecutive naturals, namely, 16445105 + ... + 16445108.

Almost surely, 2^65780426 is an apocalyptic number.

65780426 is a deficient number, since it is larger than the sum of its proper divisors (32890216).

65780426 is a wasteful number, since it uses less digits than its factorization.

65780426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32890215.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 65780426 is about 8110.5133006487. The cubic root of 65780426 is about 403.6753469633.

The spelling of 65780426 in words is "sixty-five million, seven hundred eighty thousand, four hundred twenty-six".