78201089 has 4 divisors (see below), whose sum is σ = 78225456. Its totient is φ = 78176724.

The previous prime is 78201077. The next prime is 78201113. The reversal of 78201089 is 98010287.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78201089 - 2²⁰ = 77152513 is a prime.

It is a super-2 number, since 2×78201089² = 12230820641571842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78201049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6479 + ... + 14084.

It is an arithmetic number, because the mean of its divisors is an integer number (19556364).

Almost surely, 2^78201089 is an apocalyptic number.

It is an amenable number.

78201089 is a deficient number, since it is larger than the sum of its proper divisors (24367).

78201089 is a wasteful number, since it uses less digits than its factorization.

78201089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24366.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 78201089 is about 8843.1379611538. The cubic root of 78201089 is about 427.6327260215.

The spelling of 78201089 in words is "seventy-eight million, two hundred one thousand, eighty-nine".