78812471 has 4 divisors (see below), whose sum is σ = 78840552. Its totient is φ = 78784392.

The previous prime is 78812443. The next prime is 78812497. The reversal of 78812471 is 17421887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17421887 = 7 ⋅2488841.

It is a cyclic number.

It is not a de Polignac number, because 78812471 - 2¹⁸ = 78550327 is a prime.

It is a super-3 number, since 3×78812471³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78812441) 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, 9296 + ... + 15621.

It is an arithmetic number, because the mean of its divisors is an integer number (19710138).

Almost surely, 2^78812471 is an apocalyptic number.

78812471 is a deficient number, since it is larger than the sum of its proper divisors (28081).

78812471 is a wasteful number, since it uses less digits than its factorization.

78812471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28080.

The product of its digits is 25088, while the sum is 38.

The square root of 78812471 is about 8877.6388189653. The cubic root of 78812471 is about 428.7442559728.

The spelling of 78812471 in words is "seventy-eight million, eight hundred twelve thousand, four hundred seventy-one".