78090971 has 8 divisors (see below), whose sum is σ = 89361120. Its totient is φ = 66849408.

The previous prime is 78090949. The next prime is 78091021. The reversal of 78090971 is 17909087.

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 78090971 - 2²⁶ = 10982107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78090671) 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, 926 + ... + 12531.

It is an arithmetic number, because the mean of its divisors is an integer number (11170140).

Almost surely, 2^78090971 is an apocalyptic number.

78090971 is a deficient number, since it is larger than the sum of its proper divisors (11270149).

78090971 is a wasteful number, since it uses less digits than its factorization.

78090971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14293.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 78090971 is about 8836.9095842381. The cubic root of 78090971 is about 427.4319096324.

The spelling of 78090971 in words is "seventy-eight million, ninety thousand, nine hundred seventy-one".