71780342 has 4 divisors (see below), whose sum is σ = 107670516. Its totient is φ = 35890170.

The previous prime is 71780339. The next prime is 71780353. The reversal of 71780342 is 24308717.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24308717 = 43 ⋅565319.

It is a junction number, because it is equal to n+sod(n) for n = 71780299 and 71780308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17945084 + ... + 17945087.

It is an arithmetic number, because the mean of its divisors is an integer number (26917629).

Almost surely, 2^71780342 is an apocalyptic number.

71780342 is a deficient number, since it is larger than the sum of its proper divisors (35890174).

71780342 is a wasteful number, since it uses less digits than its factorization.

71780342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35890173.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 71780342 is about 8472.3280153686. The cubic root of 71780342 is about 415.5932715674.

The spelling of 71780342 in words is "seventy-one million, seven hundred eighty thousand, three hundred forty-two".