71638305 has 8 divisors (see below), whose sum is σ = 114621312. Its totient is φ = 38207088.

The previous prime is 71638297. The next prime is 71638309. The reversal of 71638305 is 50383617.

It is a happy number.

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

It is not a de Polignac number, because 71638305 - 2³ = 71638297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71638309) 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, 2387929 + ... + 2387958.

It is an arithmetic number, because the mean of its divisors is an integer number (14327664).

Almost surely, 2^71638305 is an apocalyptic number.

It is an amenable number.

71638305 is a deficient number, since it is larger than the sum of its proper divisors (42983007).

71638305 is a wasteful number, since it uses less digits than its factorization.

71638305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775895.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 71638305 is about 8463.9414577371. The cubic root of 71638305 is about 415.3189689839.

The spelling of 71638305 in words is "seventy-one million, six hundred thirty-eight thousand, three hundred five".