1678645458 has 96 divisors (see below), whose sum is σ = 4381802880. Its totient is φ = 471692160.

The previous prime is 1678645457. The next prime is 1678645523. The reversal of 1678645458 is 8545468761.

1678645458 is a `hidden beast` number, since 1 + 67 + 86 + 454 + 58 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1678645457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 203478 + ... + 211566.

It is an arithmetic number, because the mean of its divisors is an integer number (45643780).

Almost surely, 2^1678645458 is an apocalyptic number.

1678645458 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678645458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2190901440).

1678645458 is an abundant number, since it is smaller than the sum of its proper divisors (2703157422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1678645458 is an equidigital number, since it uses as much as digits as its factorization.

1678645458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8174 (or 8162 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 54.

The square root of 1678645458 is about 40971.2760113717. The cubic root of 1678645458 is about 1188.4648089355.

The spelling of 1678645458 in words is "one billion, six hundred seventy-eight million, six hundred forty-five thousand, four hundred fifty-eight".