77727669 has 4 divisors (see below), whose sum is σ = 103636896. Its totient is φ = 51818444.

The previous prime is 77727667. The next prime is 77727673. The reversal of 77727669 is 96672777.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96672777 = 3 ⋅32224259.

It is a cyclic number.

It is not a de Polignac number, because 77727669 - 2¹ = 77727667 is a prime.

It is a super-2 number, since 2×77727669² = 12083181056347122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77727667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12954609 + ... + 12954614.

It is an arithmetic number, because the mean of its divisors is an integer number (25909224).

Almost surely, 2^77727669 is an apocalyptic number.

It is an amenable number.

77727669 is a deficient number, since it is larger than the sum of its proper divisors (25909227).

77727669 is a wasteful number, since it uses less digits than its factorization.

77727669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25909226.

The product of its digits is 1555848, while the sum is 51.

The square root of 77727669 is about 8816.3296785000. The cubic root of 77727669 is about 426.7680330311.

The spelling of 77727669 in words is "seventy-seven million, seven hundred twenty-seven thousand, six hundred sixty-nine".