71655487 has 4 divisors (see below), whose sum is σ = 71673120. Its totient is φ = 71637856.

The previous prime is 71655481. The next prime is 71655499. The reversal of 71655487 is 78455617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78455617 = 19 ⋅4129243.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71655487 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 (71655481) 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, 714 + ... + 11992.

It is an arithmetic number, because the mean of its divisors is an integer number (17918280).

Almost surely, 2^71655487 is an apocalyptic number.

71655487 is a deficient number, since it is larger than the sum of its proper divisors (17633).

71655487 is a wasteful number, since it uses less digits than its factorization.

71655487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17632.

The product of its digits is 235200, while the sum is 43.

The square root of 71655487 is about 8464.9564086296. The cubic root of 71655487 is about 415.3521702165.

The spelling of 71655487 in words is "seventy-one million, six hundred fifty-five thousand, four hundred eighty-seven".