71681477 has 4 divisors (see below), whose sum is σ = 81921696. Its totient is φ = 61441260.

The previous prime is 71681461. The next prime is 71681479. The reversal of 71681477 is 77418617.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77418617 = 73 ⋅1060529.

It is a cyclic number.

It is not a de Polignac number, because 71681477 - 2⁴ = 71681461 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 (71681479) 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, 5120099 + ... + 5120112.

It is an arithmetic number, because the mean of its divisors is an integer number (20480424).

Almost surely, 2^71681477 is an apocalyptic number.

It is an amenable number.

71681477 is a deficient number, since it is larger than the sum of its proper divisors (10240219).

71681477 is a wasteful number, since it uses less digits than its factorization.

71681477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10240218.

The product of its digits is 65856, while the sum is 41.

The square root of 71681477 is about 8466.4914220709. The cubic root of 71681477 is about 415.4023812958.

The spelling of 71681477 in words is "seventy-one million, six hundred eighty-one thousand, four hundred seventy-seven".