77908469 has 4 divisors (see below), whose sum is σ = 79566144. Its totient is φ = 76250796.

The previous prime is 77908459. The next prime is 77908477. The reversal of 77908469 is 96480977.

It is a happy number.

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: 96480977 = 71 ⋅1358887.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77908469 is a prime.

It is a super-2 number, since 2×77908469² = 12139459083847922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77908409) 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, 828767 + ... + 828860.

It is an arithmetic number, because the mean of its divisors is an integer number (19891536).

Almost surely, 2^77908469 is an apocalyptic number.

It is an amenable number.

77908469 is a deficient number, since it is larger than the sum of its proper divisors (1657675).

77908469 is a wasteful number, since it uses less digits than its factorization.

77908469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657674.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 77908469 is about 8826.5774227613. The cubic root of 77908469 is about 427.0986742399.

The spelling of 77908469 in words is "seventy-seven million, nine hundred eight thousand, four hundred sixty-nine".