71221830 has 16 divisors (see below), whose sum is σ = 170932464. Its totient is φ = 18992480.

The previous prime is 71221817. The next prime is 71221837. The reversal of 71221830 is 3812217.

It is a self number, because there is not a number n which added to its sum of digits gives 71221830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71221837) 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, 1187001 + ... + 1187060.

It is an arithmetic number, because the mean of its divisors is an integer number (10683279).

Almost surely, 2^71221830 is an apocalyptic number.

71221830 is an abundant number, since it is smaller than the sum of its proper divisors (99710634).

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

71221830 is a wasteful number, since it uses less digits than its factorization.

71221830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374071.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 71221830 is about 8439.3026963132. The cubic root of 71221830 is about 414.5125742952.

The spelling of 71221830 in words is "seventy-one million, two hundred twenty-one thousand, eight hundred thirty".