71506830 has 16 divisors (see below), whose sum is σ = 171616464. Its totient is φ = 19068480.

The previous prime is 71506817. The next prime is 71506849. The reversal of 71506830 is 3860517.

It is a super-2 number, since 2×71506830² = 10226453473297800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2383561 = 71506830 / (7 + 1 + 5 + 0 + 6 + 8 + 3 + 0).

It is a congruent number.

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, 1191751 + ... + 1191810.

It is an arithmetic number, because the mean of its divisors is an integer number (10726029).

Almost surely, 2^71506830 is an apocalyptic number.

71506830 is an abundant number, since it is smaller than the sum of its proper divisors (100109634).

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

71506830 is a wasteful number, since it uses less digits than its factorization.

71506830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383571.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 71506830 is about 8456.1711193660. The cubic root of 71506830 is about 415.0647404684.

The spelling of 71506830 in words is "seventy-one million, five hundred six thousand, eight hundred thirty".