71205156 has 60 divisors (see below), whose sum is σ = 203076720. Its totient is φ = 21576240.

The previous prime is 71205143. The next prime is 71205157. The reversal of 71205156 is 65150217.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (71205157) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6426 + ... + 13553.

It is an arithmetic number, because the mean of its divisors is an integer number (3384612).

Almost surely, 2^71205156 is an apocalyptic number.

It is an amenable number.

71205156 is an abundant number, since it is smaller than the sum of its proper divisors (131871564).

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

71205156 is a wasteful number, since it uses less digits than its factorization.

71205156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20006 (or 19995 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 71205156 is about 8438.3147606616. The cubic root of 71205156 is about 414.4802240916.

The spelling of 71205156 in words is "seventy-one million, two hundred five thousand, one hundred fifty-six".