71428197 has 4 divisors (see below), whose sum is σ = 95237600. Its totient is φ = 47618796.

The previous prime is 71428183. The next prime is 71428207. The reversal of 71428197 is 79182417.

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: 79182417 = 3 ⋅26394139.

It is not a de Polignac number, because 71428197 - 2¹⁹ = 70903909 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 (71428127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11904697 + ... + 11904702.

It is an arithmetic number, because the mean of its divisors is an integer number (23809400).

Almost surely, 2^71428197 is an apocalyptic number.

It is an amenable number.

71428197 is a deficient number, since it is larger than the sum of its proper divisors (23809403).

71428197 is a wasteful number, since it uses less digits than its factorization.

71428197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23809402.

The product of its digits is 28224, while the sum is 39.

The square root of 71428197 is about 8451.5203957631. The cubic root of 71428197 is about 414.9125416901.

The spelling of 71428197 in words is "seventy-one million, four hundred twenty-eight thousand, one hundred ninety-seven".