65238777 has 20 divisors (see below), whose sum is σ = 100819620. Its totient is φ = 41991264.

The previous prime is 65238769. The next prime is 65238821. The reversal of 65238777 is 77783256.

It can be written as a sum of positive squares in 2 ways, for example, as 37896336 + 27342441 = 6156^2 + 5229^2 .

It is not a de Polignac number, because 65238777 - 2³ = 65238769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65238727) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11538 + ... + 16235.

It is an arithmetic number, because the mean of its divisors is an integer number (5040981).

Almost surely, 2^65238777 is an apocalyptic number.

It is an amenable number.

65238777 is a deficient number, since it is larger than the sum of its proper divisors (35580843).

65238777 is a wasteful number, since it uses less digits than its factorization.

65238777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27814 (or 27805 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 65238777 is about 8077.0524945676. The cubic root of 65238777 is about 402.5643110592.

The spelling of 65238777 in words is "sixty-five million, two hundred thirty-eight thousand, seven hundred seventy-seven".