77897271 has 4 divisors (see below), whose sum is σ = 103863032. Its totient is φ = 51931512.

The previous prime is 77897263. The next prime is 77897279. The reversal of 77897271 is 17279877.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (77897263) and next prime (77897279).

It is not a de Polignac number, because 77897271 - 2³ = 77897263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77897271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77897279) 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, 12982876 + ... + 12982881.

It is an arithmetic number, because the mean of its divisors is an integer number (25965758).

Almost surely, 2^77897271 is an apocalyptic number.

77897271 is a deficient number, since it is larger than the sum of its proper divisors (25965761).

77897271 is a wasteful number, since it uses less digits than its factorization.

77897271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25965760.

The product of its digits is 345744, while the sum is 48.

The square root of 77897271 is about 8825.9430657579. The cubic root of 77897271 is about 427.0782105677.

The spelling of 77897271 in words is "seventy-seven million, eight hundred ninety-seven thousand, two hundred seventy-one".