78372869 has 8 divisors (see below), whose sum is σ = 79335192. Its totient is φ = 77414400.

The previous prime is 78372859. The next prime is 78372871. The reversal of 78372869 is 96827387.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36602500 + 41770369 = 6050^2 + 6463^2 .

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 78372869 - 2²⁰ = 77324293 is a prime.

It is a super-2 number, since 2×78372869² = 12284613190582322, which contains 22 as substring.

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 (78372859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67397 + ... + 68549.

It is an arithmetic number, because the mean of its divisors is an integer number (9916899).

Almost surely, 2^78372869 is an apocalyptic number.

It is an amenable number.

78372869 is a deficient number, since it is larger than the sum of its proper divisors (962323).

78372869 is a wasteful number, since it uses less digits than its factorization.

78372869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927.

The product of its digits is 1016064, while the sum is 50.

The square root of 78372869 is about 8852.8452488451. The cubic root of 78372869 is about 427.9456160702.

The spelling of 78372869 in words is "seventy-eight million, three hundred seventy-two thousand, eight hundred sixty-nine".