71508138 has 16 divisors (see below), whose sum is σ = 154017696. Its totient is φ = 22002480.

The previous prime is 71508121. The next prime is 71508139. The reversal of 71508138 is 83180517.

It is a super-2 number, since 2×71508138² = 10226827600454088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71508099 and 71508108.

It is not an unprimeable number, because it can be changed into a prime (71508139) 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, 458308 + ... + 458463.

It is an arithmetic number, because the mean of its divisors is an integer number (9626106).

Almost surely, 2^71508138 is an apocalyptic number.

71508138 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

71508138 is an abundant number, since it is smaller than the sum of its proper divisors (82509558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71508138 is a wasteful number, since it uses less digits than its factorization.

71508138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916789.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 71508138 is about 8456.2484589799. The cubic root of 71508138 is about 415.0672712354.

The spelling of 71508138 in words is "seventy-one million, five hundred eight thousand, one hundred thirty-eight".