77761669 has 4 divisors (see below), whose sum is σ = 77829696. Its totient is φ = 77693644.

The previous prime is 77761627. The next prime is 77761681. The reversal of 77761669 is 96616777.

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.

It is a cyclic number.

It is not a de Polignac number, because 77761669 - 2¹³ = 77753477 is a prime.

It is a super-2 number, since 2×77761669² = 12093754331331122, 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 (77761069) 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, 32269 + ... + 34594.

It is an arithmetic number, because the mean of its divisors is an integer number (19457424).

Almost surely, 2^77761669 is an apocalyptic number.

It is an amenable number.

77761669 is a deficient number, since it is larger than the sum of its proper divisors (68027).

77761669 is a wasteful number, since it uses less digits than its factorization.

77761669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68026.

The product of its digits is 666792, while the sum is 49.

The square root of 77761669 is about 8818.2577077334. The cubic root of 77761669 is about 426.8302502489.

The spelling of 77761669 in words is "seventy-seven million, seven hundred sixty-one thousand, six hundred sixty-nine".