78577091 has 8 divisors (see below), whose sum is σ = 81048384. Its totient is φ = 76139200.

The previous prime is 78577073. The next prime is 78577099. The reversal of 78577091 is 19077587.

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 78577091 - 2¹⁴ = 78560707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78577099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3530 + ... + 13023.

It is an arithmetic number, because the mean of its divisors is an integer number (10131048).

Almost surely, 2^78577091 is an apocalyptic number.

78577091 is a deficient number, since it is larger than the sum of its proper divisors (2471293).

78577091 is a wasteful number, since it uses less digits than its factorization.

78577091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16701.

The product of its (nonzero) digits is 123480, while the sum is 44.

The square root of 78577091 is about 8864.3720025730. The cubic root of 78577091 is about 428.3170035545.

The spelling of 78577091 in words is "seventy-eight million, five hundred seventy-seven thousand, ninety-one".