71690220 has 72 divisors (see below), whose sum is σ = 248530464. Its totient is φ = 16386048.

The previous prime is 71690219. The next prime is 71690221. The reversal of 71690220 is 2209617.

It is an interprime number because it is at equal distance from previous prime (71690219) and next prime (71690221).

It is not an unprimeable number, because it can be changed into a prime (71690221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27189 + ... + 29708.

It is an arithmetic number, because the mean of its divisors is an integer number (3451812).

Almost surely, 2^71690220 is an apocalyptic number.

71690220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71690220 is an abundant number, since it is smaller than the sum of its proper divisors (176840244).

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

71690220 is a wasteful number, since it uses less digits than its factorization.

71690220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56919 (or 56914 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 71690220 is about 8467.0077359124. The cubic root of 71690220 is about 415.4192695052.

Adding to 71690220 its reverse (2209617), we get a palindrome (73899837).

The spelling of 71690220 in words is "seventy-one million, six hundred ninety thousand, two hundred twenty".