71663290 has 12 divisors (see below), whose sum is σ = 129042126. Its totient is φ = 28654608.

The previous prime is 71663287. The next prime is 71663303. The reversal of 71663290 is 9236617.

It can be written as a sum of positive squares in 3 ways, for example, as 14040009 + 57623281 = 3747^2 + 7591^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25432 + ... + 28108.

Almost surely, 2^71663290 is an apocalyptic number.

71663290 is a deficient number, since it is larger than the sum of its proper divisors (57378836).

71663290 is an frugal number, since it uses more digits than its factorization.

71663290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361 (or 2684 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 71663290 is about 8465.4172962708. The cubic root of 71663290 is about 415.3672464072.

The spelling of 71663290 in words is "seventy-one million, six hundred sixty-three thousand, two hundred ninety".