71506506 has 16 divisors (see below), whose sum is σ = 146339424. Its totient is φ = 23281104.

The previous prime is 71506451. The next prime is 71506529. The reversal of 71506506 is 60560517.

It is a super-2 number, since 2×71506506² = 10226360800656072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138321 + ... + 138836.

It is an arithmetic number, because the mean of its divisors is an integer number (9146214).

Almost surely, 2^71506506 is an apocalyptic number.

71506506 is an abundant number, since it is smaller than the sum of its proper divisors (74832918).

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

71506506 is a wasteful number, since it uses less digits than its factorization.

71506506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277205.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 71506506 is about 8456.1519617377. The cubic root of 71506506 is about 415.0641135764.

The spelling of 71506506 in words is "seventy-one million, five hundred six thousand, five hundred six".