77869997 has 4 divisors (see below), whose sum is σ = 78145440. Its totient is φ = 77594556.

The previous prime is 77869991. The next prime is 77870027. The reversal of 77869997 is 79996877.

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.

It is a cyclic number.

It is not a de Polignac number, because 77869997 - 2¹⁸ = 77607853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77869991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137297 + ... + 137862.

It is an arithmetic number, because the mean of its divisors is an integer number (19536360).

Almost surely, 2^77869997 is an apocalyptic number.

It is an amenable number.

77869997 is a deficient number, since it is larger than the sum of its proper divisors (275443).

77869997 is a wasteful number, since it uses less digits than its factorization.

77869997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275442.

The product of its digits is 12002256, while the sum is 62.

The square root of 77869997 is about 8824.3978264809. The cubic root of 77869997 is about 427.0283607647.

The spelling of 77869997 in words is "seventy-seven million, eight hundred sixty-nine thousand, nine hundred ninety-seven".