78090069 has 16 divisors (see below), whose sum is σ = 108789120. Its totient is φ = 49761600.

The previous prime is 78090059. The next prime is 78090079. The reversal of 78090069 is 96009087.

It is an interprime number because it is at equal distance from previous prime (78090059) and next prime (78090079).

It is not a de Polignac number, because 78090069 - 2⁴ = 78090053 is a prime.

It is a super-2 number, since 2×78090069² = 12196117752849522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78090029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4344 + ... + 13230.

It is an arithmetic number, because the mean of its divisors is an integer number (6799320).

Almost surely, 2^78090069 is an apocalyptic number.

It is an amenable number.

78090069 is a deficient number, since it is larger than the sum of its proper divisors (30699051).

78090069 is a wasteful number, since it uses less digits than its factorization.

78090069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9020.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 78090069 is about 8836.8585481493. The cubic root of 78090069 is about 427.4302639233.

The spelling of 78090069 in words is "seventy-eight million, ninety thousand, sixty-nine".