678842499 has 4 divisors (see below), whose sum is σ = 905123336. Its totient is φ = 452561664.

The previous prime is 678842477. The next prime is 678842509. The reversal of 678842499 is 994248876.

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

It is not a de Polignac number, because 678842499 - 2⁵ = 678842467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678842399) 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, 113140414 + ... + 113140419.

It is an arithmetic number, because the mean of its divisors is an integer number (226280834).

Almost surely, 2^678842499 is an apocalyptic number.

678842499 is a deficient number, since it is larger than the sum of its proper divisors (226280837).

678842499 is a wasteful number, since it uses less digits than its factorization.

678842499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226280836.

The product of its digits is 6967296, while the sum is 57.

The square root of 678842499 is about 26054.6060994980. The cubic root of 678842499 is about 878.8666966692.

The spelling of 678842499 in words is "six hundred seventy-eight million, eight hundred forty-two thousand, four hundred ninety-nine".