65261290 has 16 divisors (see below), whose sum is σ = 117628200. Its totient is φ = 26069440.

The previous prime is 65261279. The next prime is 65261291. The reversal of 65261290 is 9216256.

It can be written as a sum of positive squares in 4 ways, for example, as 44930209 + 20331081 = 6703^2 + 4509^2 .

It is not an unprimeable number, because it can be changed into a prime (65261291) 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 in 7 ways as a sum of consecutive naturals, for example, 4236 + ... + 12184.

Almost surely, 2^65261290 is an apocalyptic number.

65261290 is a deficient number, since it is larger than the sum of its proper divisors (52366910).

65261290 is a wasteful number, since it uses less digits than its factorization.

65261290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8777.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 65261290 is about 8078.4460139311. The cubic root of 65261290 is about 402.6106121931.

The spelling of 65261290 in words is "sixty-five million, two hundred sixty-one thousand, two hundred ninety".