78169089 has 8 divisors (see below), whose sum is σ = 104334592. Its totient is φ = 52058160.

The previous prime is 78169087. The next prime is 78169093. The reversal of 78169089 is 98096187.

It is a happy number.

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

It is not a de Polignac number, because 78169089 - 2¹ = 78169087 is a prime.

It is a super-2 number, since 2×78169089² = 12220812950179842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78169087) 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, 10174 + ... + 16119.

It is an arithmetic number, because the mean of its divisors is an integer number (13041824).

Almost surely, 2^78169089 is an apocalyptic number.

It is an amenable number.

78169089 is a deficient number, since it is larger than the sum of its proper divisors (26165503).

78169089 is a wasteful number, since it uses less digits than its factorization.

78169089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27287.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 78169089 is about 8841.3284635285. The cubic root of 78169089 is about 427.5743887512.

The spelling of 78169089 in words is "seventy-eight million, one hundred sixty-nine thousand, eighty-nine".