78087799 has 8 divisors (see below), whose sum is σ = 79380000. Its totient is φ = 76804992.

The previous prime is 78087781. The next prime is 78087809. The reversal of 78087799 is 99778087.

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 78087799 - 2⁵ = 78087767 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 (78087719) 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, 15507 + ... + 19915.

It is an arithmetic number, because the mean of its divisors is an integer number (9922500).

Almost surely, 2^78087799 is an apocalyptic number.

78087799 is a deficient number, since it is larger than the sum of its proper divisors (1292201).

78087799 is a wasteful number, since it uses less digits than its factorization.

78087799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 78087799 is about 8836.7301079076. The cubic root of 78087799 is about 427.4261222268.

The spelling of 78087799 in words is "seventy-eight million, eighty-seven thousand, seven hundred ninety-nine".