1678045658 has 4 divisors (see below), whose sum is σ = 2517068490. Its totient is φ = 839022828.

The previous prime is 1678045651. The next prime is 1678045687. The reversal of 1678045658 is 8565408761.

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

It can be written as a sum of positive squares in only one way, i.e., 1428310849 + 249734809 = 37793^2 + 15803^2 .

It is not an unprimeable number, because it can be changed into a prime (1678045651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419511413 + ... + 419511416.

Almost surely, 2^1678045658 is an apocalyptic number.

1678045658 is a deficient number, since it is larger than the sum of its proper divisors (839022832).

1678045658 is an equidigital number, since it uses as much as digits as its factorization.

1678045658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839022831.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The square root of 1678045658 is about 40963.9555951327. The cubic root of 1678045658 is about 1188.3232411994.

The spelling of 1678045658 in words is "one billion, six hundred seventy-eight million, forty-five thousand, six hundred fifty-eight".