71188530 has 32 divisors (see below), whose sum is σ = 195260544. Its totient is φ = 16271616.

The previous prime is 71188477. The next prime is 71188541. The reversal of 71188530 is 3588117.

71188530 = 401² + 402² + ... + 652².

It is a junction number, because it is equal to n+sod(n) for n = 71188491 and 71188500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169287 + ... + 169706.

It is an arithmetic number, because the mean of its divisors is an integer number (6101892).

Almost surely, 2^71188530 is an apocalyptic number.

71188530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71188530 is an abundant number, since it is smaller than the sum of its proper divisors (124072014).

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

71188530 is a wasteful number, since it uses less digits than its factorization.

71188530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339010.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 71188530 is about 8437.3295538340. The cubic root of 71188530 is about 414.4479619867.

The spelling of 71188530 in words is "seventy-one million, one hundred eighty-eight thousand, five hundred thirty".