81477077 has 4 divisors (see below), whose sum is σ = 88884096. Its totient is φ = 74070060.

The previous prime is 81477049. The next prime is 81477079. The reversal of 81477077 is 77077418.

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 81477077 - 2⁶ = 81477013 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 (81477079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3703493 + ... + 3703514.

It is an arithmetic number, because the mean of its divisors is an integer number (22221024).

Almost surely, 2^81477077 is an apocalyptic number.

It is an amenable number.

81477077 is a deficient number, since it is larger than the sum of its proper divisors (7407019).

81477077 is a wasteful number, since it uses less digits than its factorization.

81477077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7407018.

The product of its (nonzero) digits is 76832, while the sum is 41.

The square root of 81477077 is about 9026.4653658007. The cubic root of 81477077 is about 433.5226706463.

The spelling of 81477077 in words is "eighty-one million, four hundred seventy-seven thousand, seventy-seven".