78313489 has 4 divisors (see below), whose sum is σ = 79791156. Its totient is φ = 76835824.

The previous prime is 78313483. The next prime is 78313493. The reversal of 78313489 is 98431387.

It is a happy number.

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 60606225 + 17707264 = 7785^2 + 4208^2 .

It is a cyclic number.

It is not a de Polignac number, because 78313489 - 2⁵ = 78313457 is a prime.

It is a super-2 number, since 2×78313489² = 12266005118706242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78313483) 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, 738754 + ... + 738859.

It is an arithmetic number, because the mean of its divisors is an integer number (19947789).

Almost surely, 2^78313489 is an apocalyptic number.

It is an amenable number.

78313489 is a deficient number, since it is larger than the sum of its proper divisors (1477667).

78313489 is a wasteful number, since it uses less digits than its factorization.

78313489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477666.

The product of its digits is 145152, while the sum is 43.

The square root of 78313489 is about 8849.4908893111. The cubic root of 78313489 is about 427.8375096491.

The spelling of 78313489 in words is "seventy-eight million, three hundred thirteen thousand, four hundred eighty-nine".