71047830 has 32 divisors (see below), whose sum is σ = 194874624. Its totient is φ = 16239456.

The previous prime is 71047771. The next prime is 71047831. The reversal of 71047830 is 3874017.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71047831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168952 + ... + 169371.

It is an arithmetic number, because the mean of its divisors is an integer number (6089832).

Almost surely, 2^71047830 is an apocalyptic number.

71047830 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71047830 is an abundant number, since it is smaller than the sum of its proper divisors (123826794).

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

71047830 is a wasteful number, since it uses less digits than its factorization.

71047830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338340.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 71047830 is about 8428.9874836780. The cubic root of 71047830 is about 414.1747377852.

The spelling of 71047830 in words is "seventy-one million, forty-seven thousand, eight hundred thirty".