77805897 has 8 divisors (see below), whose sum is σ = 111721344. Its totient is φ = 47880528.

The previous prime is 77805887. The next prime is 77805899. The reversal of 77805897 is 79850877.

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

It is not a de Polignac number, because 77805897 - 2⁴ = 77805881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77805899) 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, 997473 + ... + 997550.

It is an arithmetic number, because the mean of its divisors is an integer number (13965168).

Almost surely, 2^77805897 is an apocalyptic number.

It is an amenable number.

77805897 is a deficient number, since it is larger than the sum of its proper divisors (33915447).

77805897 is a wasteful number, since it uses less digits than its factorization.

77805897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995039.

The product of its (nonzero) digits is 987840, while the sum is 51.

The square root of 77805897 is about 8820.7651028695. The cubic root of 77805897 is about 426.9111567361.

The spelling of 77805897 in words is "seventy-seven million, eight hundred five thousand, eight hundred ninety-seven".