78497089 has 4 divisors (see below), whose sum is σ = 85633200. Its totient is φ = 71360980.

The previous prime is 78497087. The next prime is 78497093. The reversal of 78497089 is 98079487.

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 78497089 - 2¹ = 78497087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78497087) 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, 3568039 + ... + 3568060.

It is an arithmetic number, because the mean of its divisors is an integer number (21408300).

Almost surely, 2^78497089 is an apocalyptic number.

It is an amenable number.

78497089 is a deficient number, since it is larger than the sum of its proper divisors (7136111).

78497089 is a wasteful number, since it uses less digits than its factorization.

78497089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7136110.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 78497089 is about 8859.8582945779. The cubic root of 78497089 is about 428.1715928406.

The spelling of 78497089 in words is "seventy-eight million, four hundred ninety-seven thousand, eighty-nine".