71478257 has 4 divisors (see below), whose sum is σ = 71622000. Its totient is φ = 71334516.

The previous prime is 71478221. The next prime is 71478259. The reversal of 71478257 is 75287417.

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: 75287417 = 6553 ⋅11489.

It is a cyclic number.

It is not a de Polignac number, because 71478257 - 2⁶ = 71478193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71478259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71123 + ... + 72120.

It is an arithmetic number, because the mean of its divisors is an integer number (17905500).

Almost surely, 2^71478257 is an apocalyptic number.

It is an amenable number.

71478257 is a deficient number, since it is larger than the sum of its proper divisors (143743).

71478257 is a wasteful number, since it uses less digits than its factorization.

71478257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143742.

The product of its digits is 109760, while the sum is 41.

The square root of 71478257 is about 8454.4814743425. The cubic root of 71478257 is about 415.0094486647.

The spelling of 71478257 in words is "seventy-one million, four hundred seventy-eight thousand, two hundred fifty-seven".