78890869 has 8 divisors (see below), whose sum is σ = 84214080. Its totient is φ = 73684800.

The previous prime is 78890857. The next prime is 78890909. The reversal of 78890869 is 96809887.

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 78890869 - 2⁷ = 78890741 is a prime.

It is a super-2 number, since 2×78890869² = 12447538423150322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78890809) 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, 27892 + ... + 30589.

It is an arithmetic number, because the mean of its divisors is an integer number (10526760).

Almost surely, 2^78890869 is an apocalyptic number.

It is an amenable number.

78890869 is a deficient number, since it is larger than the sum of its proper divisors (5323211).

78890869 is a wasteful number, since it uses less digits than its factorization.

78890869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58571.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 78890869 is about 8882.0531973187. The cubic root of 78890869 is about 428.8863720305.

The spelling of 78890869 in words is "seventy-eight million, eight hundred ninety thousand, eight hundred sixty-nine".