787990 has 16 divisors (see below), whose sum is σ = 1621152. Its totient is φ = 270144.

The previous prime is 787981. The next prime is 787993. The reversal of 787990 is 99787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787993) by changing a digit.

787990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5559 + ... + 5698.

It is an arithmetic number, because the mean of its divisors is an integer number (101322).

2⁷⁸⁷⁹⁹⁰ is an apocalyptic number.

787990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

787990 is an abundant number, since it is smaller than the sum of its proper divisors (833162).

It is a weird number, because it is abundant, but not a pseudoperfect number.

787990 is a wasteful number, since it uses less digits than its factorization.

787990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11271.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 787990 is about 887.6880082552. The cubic root of 787990 is about 92.3648867413.

The spelling of 787990 in words is "seven hundred eighty-seven thousand, nine hundred ninety".