71285690 has 40 divisors (see below), whose sum is σ = 149741460. Its totient is φ = 24432576.

The previous prime is 71285681. The next prime is 71285723. The reversal of 71285690 is 9658217.

It can be written as a sum of positive squares in 2 ways, for example, as 59182249 + 12103441 = 7693^2 + 3479^2 .

It is a super-2 number, since 2×71285690² = 10163299197552200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22526 + ... + 25494.

Almost surely, 2^71285690 is an apocalyptic number.

71285690 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71285690 is an abundant number, since it is smaller than the sum of its proper divisors (78455770).

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

71285690 is an equidigital number, since it uses as much as digits as its factorization.

71285690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004 (or 2983 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 71285690 is about 8443.0853365343. The cubic root of 71285690 is about 414.6364261413.

The spelling of 71285690 in words is "seventy-one million, two hundred eighty-five thousand, six hundred ninety".