786636561 has 8 divisors (see below), whose sum is σ = 1049085184. Its totient is φ = 524306160.

The previous prime is 786636553. The next prime is 786636583. The reversal of 786636561 is 165636687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 786636561 - 2³ = 786636553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 786636561.

It is not an unprimeable number, because it can be changed into a prime (786631561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12646 + ... + 41631.

It is an arithmetic number, because the mean of its divisors is an integer number (131135648).

Almost surely, 2^786636561 is an apocalyptic number.

It is an amenable number.

786636561 is a deficient number, since it is larger than the sum of its proper divisors (262448623).

786636561 is a wasteful number, since it uses less digits than its factorization.

786636561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59111.

The product of its digits is 1088640, while the sum is 48.

The square root of 786636561 is about 28047.0419295868. The cubic root of 786636561 is about 923.1197495296.

The spelling of 786636561 in words is "seven hundred eighty-six million, six hundred thirty-six thousand, five hundred sixty-one".