71861240 has 32 divisors (see below), whose sum is σ = 176387760. Its totient is φ = 26131200.

The previous prime is 71861239. The next prime is 71861263. The reversal of 71861240 is 4216817.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81221 + ... + 82100.

Almost surely, 2^71861240 is an apocalyptic number.

It is an amenable number.

71861240 is an abundant number, since it is smaller than the sum of its proper divisors (104526520).

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

71861240 is a wasteful number, since it uses less digits than its factorization.

71861240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163343 (or 163339 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 71861240 is about 8477.1009195361. The cubic root of 71861240 is about 415.7493404903.

The spelling of 71861240 in words is "seventy-one million, eight hundred sixty-one thousand, two hundred forty".