78113489 has 4 divisors (see below), whose sum is σ = 79394100. Its totient is φ = 76832880.

The previous prime is 78113471. The next prime is 78113527. The reversal of 78113489 is 98431187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34023889 + 44089600 = 5833^2 + 6640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78113489 is a prime.

It is a super-2 number, since 2×78113489² = 12203434327506242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78113429) 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, 640214 + ... + 640335.

It is an arithmetic number, because the mean of its divisors is an integer number (19848525).

Almost surely, 2^78113489 is an apocalyptic number.

It is an amenable number.

78113489 is a deficient number, since it is larger than the sum of its proper divisors (1280611).

78113489 is a wasteful number, since it uses less digits than its factorization.

78113489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280610.

The product of its digits is 48384, while the sum is 41.

The square root of 78113489 is about 8838.1835803518. The cubic root of 78113489 is about 427.4729898692.

The spelling of 78113489 in words is "seventy-eight million, one hundred thirteen thousand, four hundred eighty-nine".