71978469 has 4 divisors (see below), whose sum is σ = 95971296. Its totient is φ = 47985644.

The previous prime is 71978461. The next prime is 71978537. The reversal of 71978469 is 96487917.

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: 96487917 = 3 ⋅32162639.

It is a cyclic number.

It is not a de Polignac number, because 71978469 - 2³ = 71978461 is a prime.

It is a super-2 number, since 2×71978469² = 10361799999167922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71978461) 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, 11996409 + ... + 11996414.

It is an arithmetic number, because the mean of its divisors is an integer number (23992824).

Almost surely, 2^71978469 is an apocalyptic number.

It is an amenable number.

71978469 is a deficient number, since it is larger than the sum of its proper divisors (23992827).

71978469 is a wasteful number, since it uses less digits than its factorization.

71978469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23992826.

The product of its digits is 762048, while the sum is 51.

The square root of 71978469 is about 8484.0125530317. The cubic root of 71978469 is about 415.9752916938.

The spelling of 71978469 in words is "seventy-one million, nine hundred seventy-eight thousand, four hundred sixty-nine".