71905530 has 16 divisors (see below), whose sum is σ = 172573344. Its totient is φ = 19174800.

The previous prime is 71905499. The next prime is 71905543. The reversal of 71905530 is 3550917.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2396851 = 71905530 / (7 + 1 + 9 + 0 + 5 + 5 + 3 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198396 + ... + 1198455.

It is an arithmetic number, because the mean of its divisors is an integer number (10785834).

Almost surely, 2^71905530 is an apocalyptic number.

71905530 is an abundant number, since it is smaller than the sum of its proper divisors (100667814).

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

71905530 is a wasteful number, since it uses less digits than its factorization.

71905530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396861.

The product of its (nonzero) digits is 4725, while the sum is 30.

The square root of 71905530 is about 8479.7128489118. The cubic root of 71905530 is about 415.8347354203.

It can be divided in two parts, 7190 and 5530, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 71905530 in words is "seventy-one million, nine hundred five thousand, five hundred thirty".