71669257 has 4 divisors (see below), whose sum is σ = 78184656. Its totient is φ = 65153860.

The previous prime is 71669249. The next prime is 71669267. The reversal of 71669257 is 75296617.

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 71669257 - 2³ = 71669249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71669207) 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, 3257683 + ... + 3257704.

It is an arithmetic number, because the mean of its divisors is an integer number (19546164).

Almost surely, 2^71669257 is an apocalyptic number.

It is an amenable number.

71669257 is a deficient number, since it is larger than the sum of its proper divisors (6515399).

71669257 is a wasteful number, since it uses less digits than its factorization.

71669257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6515398.

The product of its digits is 158760, while the sum is 43.

The square root of 71669257 is about 8465.7697228309. The cubic root of 71669257 is about 415.3787745204.

It can be divided in two parts, 7 and 1669257, that added together give a square (1669264 = 1292²).

The spelling of 71669257 in words is "seventy-one million, six hundred sixty-nine thousand, two hundred fifty-seven".