77579661 has 8 divisors (see below), whose sum is σ = 103793760. Its totient is φ = 51542672.

The previous prime is 77579647. The next prime is 77579699. The reversal of 77579661 is 16697577.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 77579661 - 2⁹ = 77579149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77579661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77572661) 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, 43251 + ... + 45008.

It is an arithmetic number, because the mean of its divisors is an integer number (12974220).

Almost surely, 2^77579661 is an apocalyptic number.

It is an amenable number.

77579661 is a deficient number, since it is larger than the sum of its proper divisors (26214099).

77579661 is a wasteful number, since it uses less digits than its factorization.

77579661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88555.

The product of its digits is 555660, while the sum is 48.

The square root of 77579661 is about 8807.9317095445. The cubic root of 77579661 is about 426.4969788963.

The spelling of 77579661 in words is "seventy-seven million, five hundred seventy-nine thousand, six hundred sixty-one".