78909077 has 8 divisors (see below), whose sum is σ = 85048320. Its totient is φ = 72779760.

The previous prime is 78909041. The next prime is 78909079. The reversal of 78909077 is 77090987.

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

It is a cyclic number.

It is not a de Polignac number, because 78909077 - 2²⁰ = 77860501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78909079) 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, 27752 + ... + 30462.

It is an arithmetic number, because the mean of its divisors is an integer number (10631040).

Almost surely, 2^78909077 is an apocalyptic number.

It is an amenable number.

78909077 is a deficient number, since it is larger than the sum of its proper divisors (6139243).

78909077 is a wasteful number, since it uses less digits than its factorization.

78909077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963.

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 78909077 is about 8883.0781264154. The cubic root of 78909077 is about 428.9193651278.

The spelling of 78909077 in words is "seventy-eight million, nine hundred nine thousand, seventy-seven".