71394778 has 16 divisors (see below), whose sum is σ = 131806080. Its totient is φ = 28244016.

The previous prime is 71394773. The next prime is 71394809. The reversal of 71394778 is 87749317.

It is not an unprimeable number, because it can be changed into a prime (71394773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195958 + ... + 196321.

It is an arithmetic number, because the mean of its divisors is an integer number (8237880).

Almost surely, 2^71394778 is an apocalyptic number.

71394778 is a deficient number, since it is larger than the sum of its proper divisors (60411302).

71394778 is a wasteful number, since it uses less digits than its factorization.

71394778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392301.

The product of its digits is 296352, while the sum is 46.

The square root of 71394778 is about 8449.5430645686. The cubic root of 71394778 is about 414.8478234329.

It can be divided in two parts, 713947 and 78, that added together give a square (714025 = 845²).

The spelling of 71394778 in words is "seventy-one million, three hundred ninety-four thousand, seven hundred seventy-eight".