78887093 has 4 divisors (see below), whose sum is σ = 79700460. Its totient is φ = 78073728.

The previous prime is 78887077. The next prime is 78887117. The reversal of 78887093 is 39078887.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44863204 + 34023889 = 6698^2 + 5833^2 .

It is a cyclic number.

It is not a de Polignac number, because 78887093 - 2⁴ = 78887077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78887023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406538 + ... + 406731.

It is an arithmetic number, because the mean of its divisors is an integer number (19925115).

Almost surely, 2^78887093 is an apocalyptic number.

It is an amenable number.

78887093 is a deficient number, since it is larger than the sum of its proper divisors (813367).

78887093 is an equidigital number, since it uses as much as digits as its factorization.

78887093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813366.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 78887093 is about 8881.8406313106. The cubic root of 78887093 is about 428.8795292412.

The spelling of 78887093 in words is "seventy-eight million, eight hundred eighty-seven thousand, ninety-three".