71638090 has 8 divisors (see below), whose sum is σ = 128948580. Its totient is φ = 28655232.

The previous prime is 71638079. The next prime is 71638093. The reversal of 71638090 is 9083617.

It can be written as a sum of positive squares in 2 ways, for example, as 68508729 + 3129361 = 8277^2 + 1769^2 .

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

It is not an unprimeable number, because it can be changed into a prime (71638093) 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, 3581895 + ... + 3581914.

Almost surely, 2^71638090 is an apocalyptic number.

71638090 is a deficient number, since it is larger than the sum of its proper divisors (57310490).

71638090 is a wasteful number, since it uses less digits than its factorization.

71638090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7163816.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 71638090 is about 8463.9287567890. The cubic root of 71638090 is about 415.3185535001.

The spelling of 71638090 in words is "seventy-one million, six hundred thirty-eight thousand, ninety".