78547481 has 4 divisors (see below), whose sum is σ = 80218752. Its totient is φ = 76876212.

The previous prime is 78547477. The next prime is 78547519. The reversal of 78547481 is 18474587.

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: 18474587 = 137 ⋅134851.

It is a cyclic number.

It is not a de Polignac number, because 78547481 - 2² = 78547477 is a prime.

It is a super-2 number, since 2×78547481² = 12339413542890722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78547451) 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, 835565 + ... + 835658.

It is an arithmetic number, because the mean of its divisors is an integer number (20054688).

Almost surely, 2^78547481 is an apocalyptic number.

It is an amenable number.

78547481 is a deficient number, since it is larger than the sum of its proper divisors (1671271).

78547481 is a wasteful number, since it uses less digits than its factorization.

78547481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671270.

The product of its digits is 250880, while the sum is 44.

The square root of 78547481 is about 8862.7016761256. The cubic root of 78547481 is about 428.2631962693.

The spelling of 78547481 in words is "seventy-eight million, five hundred forty-seven thousand, four hundred eighty-one".