1990078680 has 64 divisors (see below), whose sum is σ = 6229820160. Its totient is φ = 507613568.

The previous prime is 1990078669. The next prime is 1990078681. The reversal of 1990078680 is 868700991.

It is a happy number.

1990078680 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990078681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357762 + ... + 363281.

It is an arithmetic number, because the mean of its divisors is an integer number (97340940).

Almost surely, 2^1990078680 is an apocalyptic number.

1990078680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990078680 is an abundant number, since it is smaller than the sum of its proper divisors (4239741480).

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

1990078680 is a wasteful number, since it uses less digits than its factorization.

1990078680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721080 (or 721076 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1990078680 is about 44610.2979142709. The cubic root of 1990078680 is about 1257.8342487928.

The spelling of 1990078680 in words is "one billion, nine hundred ninety million, seventy-eight thousand, six hundred eighty".