1993690280 has 16 divisors (see below), whose sum is σ = 4485803220. Its totient is φ = 797476096.

The previous prime is 1993690261. The next prime is 1993690337. The reversal of 1993690280 is 820963991.

It can be written as a sum of positive squares in 2 ways, for example, as 1973314084 + 20376196 = 44422^2 + 4514^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24921089 + ... + 24921168.

Almost surely, 2^1993690280 is an apocalyptic number.

1993690280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1993690280 is an abundant number, since it is smaller than the sum of its proper divisors (2492112940).

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

1993690280 is a wasteful number, since it uses less digits than its factorization.

1993690280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49842268 (or 49842264 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1993690280 is about 44650.7590081065. The cubic root of 1993690280 is about 1258.5946959206.

The spelling of 1993690280 in words is "one billion, nine hundred ninety-three million, six hundred ninety thousand, two hundred eighty".