78887091 has 8 divisors (see below), whose sum is σ = 106907344. Its totient is φ = 51729120.

The previous prime is 78887077. The next prime is 78887117. The reversal of 78887091 is 19078887.

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

It is not a de Polignac number, because 78887091 - 2⁷ = 78886963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78887091.

It is not an unprimeable number, because it can be changed into a prime (78889091) 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, 215356 + ... + 215721.

It is an arithmetic number, because the mean of its divisors is an integer number (13363418).

Almost surely, 2^78887091 is an apocalyptic number.

78887091 is a deficient number, since it is larger than the sum of its proper divisors (28020253).

78887091 is a wasteful number, since it uses less digits than its factorization.

78887091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431141.

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 78887091 is about 8881.8405187213. The cubic root of 78887091 is about 428.8795256168.

The spelling of 78887091 in words is "seventy-eight million, eight hundred eighty-seven thousand, ninety-one".