1678625685 has 24 divisors (see below), whose sum is σ = 3174129504. Its totient is φ = 813878880.

The previous prime is 1678625659. The next prime is 1678625687. The reversal of 1678625685 is 5865268761.

1678625685 is a `hidden beast` number, since 1 + 6 + 7 + 8 + 625 + 6 + 8 + 5 = 666.

It is not a de Polignac number, because 1678625685 - 2⁵ = 1678625653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678625687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1695087 + ... + 1696076.

It is an arithmetic number, because the mean of its divisors is an integer number (132255396).

Almost surely, 2^1678625685 is an apocalyptic number.

1678625685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1678625685 is a deficient number, since it is larger than the sum of its proper divisors (1495503819).

1678625685 is a wasteful number, since it uses less digits than its factorization.

1678625685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391185 (or 3391182 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The square root of 1678625685 is about 40971.0347074613. The cubic root of 1678625685 is about 1188.4601425527.

The spelling of 1678625685 in words is "one billion, six hundred seventy-eight million, six hundred twenty-five thousand, six hundred eighty-five".