1999696720 has 40 divisors (see below), whose sum is σ = 5313481344. Its totient is φ = 685610112.

The previous prime is 1999696691. The next prime is 1999696747. The reversal of 1999696720 is 276969991.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1784884 + ... + 1786003.

Almost surely, 2^1999696720 is an apocalyptic number.

1999696720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999696720 is an abundant number, since it is smaller than the sum of its proper divisors (3313784624).

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

1999696720 is a wasteful number, since it uses less digits than its factorization.

1999696720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570907 (or 3570901 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 58.

The square root of 1999696720 is about 44717.9686479607. The cubic root of 1999696720 is about 1259.8573618662.

The spelling of 1999696720 in words is "one billion, nine hundred ninety-nine million, six hundred ninety-six thousand, seven hundred twenty".