71861436 has 36 divisors (see below), whose sum is σ = 182752752. Its totient is φ = 23808384.

The previous prime is 71861423. The next prime is 71861459. The reversal of 71861436 is 63416817.

71861436 is a `hidden beast` number, since 7 + 1 + 8 + 614 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 71861436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36 + ... + 11988.

Almost surely, 2^71861436 is an apocalyptic number.

It is an amenable number.

71861436 is an abundant number, since it is smaller than the sum of its proper divisors (110891316).

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

71861436 is a wasteful number, since it uses less digits than its factorization.

71861436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12130 (or 12125 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 71861436 is about 8477.1124800842. The cubic root of 71861436 is about 415.7497184725.

The spelling of 71861436 in words is "seventy-one million, eight hundred sixty-one thousand, four hundred thirty-six".