678394624 has 18 divisors (see below), whose sum is σ = 1354139780. Its totient is φ = 339197184.

The previous prime is 678394609. The next prime is 678394627. The reversal of 678394624 is 426493876.

It is not an unprimeable number, because it can be changed into a prime (678394627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1324734 + ... + 1325245.

Almost surely, 2^678394624 is an apocalyptic number.

678394624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

678394624 is a deficient number, since it is larger than the sum of its proper divisors (675745156).

678394624 is an equidigital number, since it uses as much as digits as its factorization.

678394624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649995 (or 2649981 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 49.

The square root of 678394624 is about 26046.0097519754. The cubic root of 678394624 is about 878.6733729748.

The spelling of 678394624 in words is "six hundred seventy-eight million, three hundred ninety-four thousand, six hundred twenty-four".