78057089 has 4 divisors (see below), whose sum is σ = 85153200. Its totient is φ = 70960980.

The previous prime is 78057061. The next prime is 78057107. The reversal of 78057089 is 98075087.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98075087 = 11 ⋅8915917.

It is a cyclic number.

It is not a de Polignac number, because 78057089 - 2⁸ = 78056833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78057019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3548039 + ... + 3548060.

It is an arithmetic number, because the mean of its divisors is an integer number (21288300).

Almost surely, 2^78057089 is an apocalyptic number.

It is an amenable number.

78057089 is a deficient number, since it is larger than the sum of its proper divisors (7096111).

78057089 is a wasteful number, since it uses less digits than its factorization.

78057089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7096110.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 78057089 is about 8834.9923033356. The cubic root of 78057089 is about 427.3700828390.

The spelling of 78057089 in words is "seventy-eight million, fifty-seven thousand, eighty-nine".