65486781 has 12 divisors (see below), whose sum is σ = 97149052. Its totient is φ = 42477696.

The previous prime is 65486753. The next prime is 65486789. The reversal of 65486781 is 18768456.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57836025 + 7650756 = 7605^2 + 2766^2 .

It is not a de Polignac number, because 65486781 - 2²² = 61292477 is a prime.

It is a super-2 number, since 2×65486781² = 8577036971483922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65486789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97996 + ... + 98661.

Almost surely, 2^65486781 is an apocalyptic number.

It is an amenable number.

65486781 is a deficient number, since it is larger than the sum of its proper divisors (31662271).

65486781 is a wasteful number, since it uses less digits than its factorization.

65486781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196700 (or 196697 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 65486781 is about 8092.3903143632. The cubic root of 65486781 is about 403.0737796109.

The spelling of 65486781 in words is "sixty-five million, four hundred eighty-six thousand, seven hundred eighty-one".