71212690 has 16 divisors (see below), whose sum is σ = 132603480. Its totient is φ = 27502720.

The previous prime is 71212667. The next prime is 71212699. The reversal of 71212690 is 9621217.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61042969 + 10169721 = 7813^2 + 3189^2 .

It is a super-2 number, since 2×71212690² = 10142494434072200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71212699) 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, 122491 + ... + 123070.

Almost surely, 2^71212690 is an apocalyptic number.

71212690 is a deficient number, since it is larger than the sum of its proper divisors (61390790).

71212690 is a wasteful number, since it uses less digits than its factorization.

71212690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245597.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 71212690 is about 8438.7611650052. The cubic root of 71212690 is about 414.4948418714.

The spelling of 71212690 in words is "seventy-one million, two hundred twelve thousand, six hundred ninety".