71819790 has 48 divisors (see below), whose sum is σ = 200513232. Its totient is φ = 16415616.

The previous prime is 71819743. The next prime is 71819801. The reversal of 71819790 is 9791817.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22959 + ... + 25898.

It is an arithmetic number, because the mean of its divisors is an integer number (4177359).

Almost surely, 2^71819790 is an apocalyptic number.

71819790 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71819790 is an abundant number, since it is smaller than the sum of its proper divisors (128693442).

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

71819790 is a wasteful number, since it uses less digits than its factorization.

71819790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48881 (or 48874 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 71819790 is about 8474.6557452206. The cubic root of 71819790 is about 415.6693895341.

The spelling of 71819790 in words is "seventy-one million, eight hundred nineteen thousand, seven hundred ninety".