1985679808 has 56 divisors (see below), whose sum is σ = 4577124704. Its totient is φ = 837043200.

The previous prime is 1985679767. The next prime is 1985679809. The reversal of 1985679808 is 8089765891.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985679809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9003 + ... + 63658.

Almost surely, 2^1985679808 is an apocalyptic number.

It is an amenable number.

1985679808 is an abundant number, since it is smaller than the sum of its proper divisors (2591444896).

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

1985679808 is an equidigital number, since it uses as much as digits as its factorization.

1985679808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72741 (or 72731 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 61.

The square root of 1985679808 is about 44560.9673144558. The cubic root of 1985679808 is about 1256.9067923927.

The spelling of 1985679808 in words is "one billion, nine hundred eighty-five million, six hundred seventy-nine thousand, eight hundred eight".