71638138 has 32 divisors (see below), whose sum is σ = 126749952. Its totient is φ = 29937600.

The previous prime is 71638121. The next prime is 71638159. The reversal of 71638138 is 83183617.

It is a super-2 number, since 2×71638138² = 10264045632214088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71638097 and 71638106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132148 + ... + 132688.

It is an arithmetic number, because the mean of its divisors is an integer number (3960936).

Almost surely, 2^71638138 is an apocalyptic number.

71638138 is a deficient number, since it is larger than the sum of its proper divisors (55111814).

71638138 is a wasteful number, since it uses less digits than its factorization.

71638138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030.

The product of its digits is 24192, while the sum is 37.

The square root of 71638138 is about 8463.9315923512. The cubic root of 71638138 is about 415.3186462593.

The spelling of 71638138 in words is "seventy-one million, six hundred thirty-eight thousand, one hundred thirty-eight".