71638233 has 4 divisors (see below), whose sum is σ = 95517648. Its totient is φ = 47758820.

The previous prime is 71638211. The next prime is 71638277. The reversal of 71638233 is 33283617.

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.

It is a cyclic number.

It is not a de Polignac number, because 71638233 - 2⁹ = 71637721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71638194 and 71638203.

It is not an unprimeable number, because it can be changed into a prime (71638433) 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, 11939703 + ... + 11939708.

It is an arithmetic number, because the mean of its divisors is an integer number (23879412).

Almost surely, 2^71638233 is an apocalyptic number.

It is an amenable number.

71638233 is a deficient number, since it is larger than the sum of its proper divisors (23879415).

71638233 is a wasteful number, since it uses less digits than its factorization.

71638233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23879414.

The product of its digits is 18144, while the sum is 33.

The square root of 71638233 is about 8463.9372043984. The cubic root of 71638233 is about 415.3188298452.

The spelling of 71638233 in words is "seventy-one million, six hundred thirty-eight thousand, two hundred thirty-three".