77845481 has 4 divisors (see below), whose sum is σ = 88966272. Its totient is φ = 66724692.

The previous prime is 77845403. The next prime is 77845487. The reversal of 77845481 is 18454877.

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 a de Polignac number, because none of the positive numbers 2^k-77845481 is a prime.

It is a super-2 number, since 2×77845481² = 12119837824242722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77845487) 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, 5560385 + ... + 5560398.

It is an arithmetic number, because the mean of its divisors is an integer number (22241568).

Almost surely, 2^77845481 is an apocalyptic number.

It is an amenable number.

77845481 is a deficient number, since it is larger than the sum of its proper divisors (11120791).

77845481 is a wasteful number, since it uses less digits than its factorization.

77845481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120790.

The product of its digits is 250880, while the sum is 44.

The square root of 77845481 is about 8823.0086138460. The cubic root of 77845481 is about 426.9835419361.

The spelling of 77845481 in words is "seventy-seven million, eight hundred forty-five thousand, four hundred eighty-one".