71778361 has 8 divisors (see below), whose sum is σ = 74192384. Its totient is φ = 69370560.

The previous prime is 71778347. The next prime is 71778383. The reversal of 71778361 is 16387717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71778361 - 2²⁵ = 38223929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71776361) 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, 39505 + ... + 41281.

It is an arithmetic number, because the mean of its divisors is an integer number (9274048).

Almost surely, 2^71778361 is an apocalyptic number.

It is an amenable number.

71778361 is a deficient number, since it is larger than the sum of its proper divisors (2414023).

71778361 is a wasteful number, since it uses less digits than its factorization.

71778361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111.

The product of its digits is 49392, while the sum is 40.

The square root of 71778361 is about 8472.2111045464. The cubic root of 71778361 is about 415.5894483394.

The spelling of 71778361 in words is "seventy-one million, seven hundred seventy-eight thousand, three hundred sixty-one".