71778476 has 48 divisors (see below), whose sum is σ = 157420032. Its totient is φ = 27820800.

The previous prime is 71778467. The next prime is 71778503. The reversal of 71778476 is 67487717.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 71778476.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73745 + ... + 74711.

It is an arithmetic number, because the mean of its divisors is an integer number (3279584).

Almost surely, 2^71778476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71778476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78710016).

71778476 is an abundant number, since it is smaller than the sum of its proper divisors (85641556).

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

71778476 is a wasteful number, since it uses less digits than its factorization.

71778476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 1228 counting only the distinct ones).

The product of its digits is 460992, while the sum is 47.

The square root of 71778476 is about 8472.2178914379. The cubic root of 71778476 is about 415.5896702854.

The spelling of 71778476 in words is "seventy-one million, seven hundred seventy-eight thousand, four hundred seventy-six".