1868691720 has 64 divisors (see below), whose sum is σ = 6406945920. Its totient is φ = 427129344.

The previous prime is 1868691709. The next prime is 1868691823. The reversal of 1868691720 is 271968681.

1868691720 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1868691720.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1111477 + ... + 1113156.

It is an arithmetic number, because the mean of its divisors is an integer number (100108530).

Almost surely, 2^1868691720 is an apocalyptic number.

1868691720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1868691720 is an abundant number, since it is smaller than the sum of its proper divisors (4538254200).

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

1868691720 is a wasteful number, since it uses less digits than its factorization.

1868691720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224654 (or 2224650 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 1868691720 is about 43228.3670753361. The cubic root of 1868691720 is about 1231.7215894894.

The spelling of 1868691720 in words is "one billion, eight hundred sixty-eight million, six hundred ninety-one thousand, seven hundred twenty".