71280393 has 8 divisors (see below), whose sum is σ = 95315808. Its totient is φ = 47382624.

The previous prime is 71280383. The next prime is 71280409. The reversal of 71280393 is 39308217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71280393 - 2⁵ = 71280361 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71280373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33196 + ... + 35277.

It is an arithmetic number, because the mean of its divisors is an integer number (11914476).

Almost surely, 2^71280393 is an apocalyptic number.

It is an amenable number.

71280393 is a deficient number, since it is larger than the sum of its proper divisors (24035415).

71280393 is a wasteful number, since it uses less digits than its factorization.

71280393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68823.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 71280393 is about 8442.7716420616. The cubic root of 71280393 is about 414.6261558072.

The spelling of 71280393 in words is "seventy-one million, two hundred eighty thousand, three hundred ninety-three".