1990725690780 has 60 divisors (see below), whose sum is σ = 6244980227640. Its totient is φ = 530860183776.

The previous prime is 1990725690761. The next prime is 1990725690787. The reversal of 1990725690780 is 870965270991.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990725690787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 614419890 + ... + 614423129.

It is an arithmetic number, because the mean of its divisors is an integer number (104083003794).

Almost surely, 2^{1990725690780} is an apocalyptic number.

1990725690780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990725690780 is an abundant number, since it is smaller than the sum of its proper divisors (4254254536860).

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

1990725690780 is a wasteful number, since it uses less digits than its factorization.

1990725690780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228843040 (or 1228843029 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 63.

The spelling of 1990725690780 in words is "one trillion, nine hundred ninety billion, seven hundred twenty-five million, six hundred ninety thousand, seven hundred eighty".