11287990 has 48 divisors (see below), whose sum is σ = 24050592. Its totient is φ = 3735936.

The previous prime is 11287981. The next prime is 11288003. The reversal of 11287990 is 9978211.

11287990 = 210² + 211² + ... + 350².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154594 + ... + 154666.

It is an arithmetic number, because the mean of its divisors is an integer number (501054).

Almost surely, 2^11287990 is an apocalyptic number.

11287990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11287990 is an abundant number, since it is smaller than the sum of its proper divisors (12762602).

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

11287990 is an equidigital number, since it uses as much as digits as its factorization.

11287990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 11287990 is about 3359.7604081244. The cubic root of 11287990 is about 224.3221740511.

The spelling of 11287990 in words is "eleven million, two hundred eighty-seven thousand, nine hundred ninety".