77955771 has 4 divisors (see below), whose sum is σ = 103941032. Its totient is φ = 51970512.

The previous prime is 77955749. The next prime is 77955791. The reversal of 77955771 is 17755977.

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

It is not a de Polignac number, because 77955771 - 2⁷ = 77955643 is a prime.

It is a super-3 number, since 3×77955771³ (a number of 25 digits) contains 333 as substring.

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 77955771.

It is not an unprimeable number, because it can be changed into a prime (77955701) 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, 12992626 + ... + 12992631.

It is an arithmetic number, because the mean of its divisors is an integer number (25985258).

Almost surely, 2^77955771 is an apocalyptic number.

77955771 is a deficient number, since it is larger than the sum of its proper divisors (25985261).

77955771 is a wasteful number, since it uses less digits than its factorization.

77955771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25985260.

The product of its digits is 540225, while the sum is 48.

The square root of 77955771 is about 8829.2565372176. The cubic root of 77955771 is about 427.1850941737.

The spelling of 77955771 in words is "seventy-seven million, nine hundred fifty-five thousand, seven hundred seventy-one".