77744661 has 8 divisors (see below), whose sum is σ = 103727424. Its totient is φ = 51795840.

The previous prime is 77744647. The next prime is 77744687. The reversal of 77744661 is 16644777.

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

It is not a de Polignac number, because 77744661 - 2⁵ = 77744629 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77744461) 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, 2545 + ... + 12726.

It is an arithmetic number, because the mean of its divisors is an integer number (12965928).

Almost surely, 2^77744661 is an apocalyptic number.

77744661 is the 5091-st octagonal number.

It is an amenable number.

77744661 is a deficient number, since it is larger than the sum of its proper divisors (25982763).

77744661 is a wasteful number, since it uses less digits than its factorization.

77744661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16971.

The product of its digits is 197568, while the sum is 42.

The square root of 77744661 is about 8817.2932921617. The cubic root of 77744661 is about 426.7991292681.

The spelling of 77744661 in words is "seventy-seven million, seven hundred forty-four thousand, six hundred sixty-one".