678213454 has 4 divisors (see below), whose sum is σ = 1017320184. Its totient is φ = 339106726.

The previous prime is 678213449. The next prime is 678213461. The reversal of 678213454 is 454312876.

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

It is a super-2 number, since 2×678213454² = 919946978373220232, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169553362 + ... + 169553365.

It is an arithmetic number, because the mean of its divisors is an integer number (254330046).

Almost surely, 2^678213454 is an apocalyptic number.

678213454 is a deficient number, since it is larger than the sum of its proper divisors (339106730).

678213454 is a wasteful number, since it uses less digits than its factorization.

678213454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339106729.

The product of its digits is 161280, while the sum is 40.

The square root of 678213454 is about 26042.5316357684. The cubic root of 678213454 is about 878.5951474002.

The spelling of 678213454 in words is "six hundred seventy-eight million, two hundred thirteen thousand, four hundred fifty-four".