1990088520 has 128 divisors (see below), whose sum is σ = 6952055040. Its totient is φ = 446284800.

The previous prime is 1990088509. The next prime is 1990088563. The reversal of 1990088520 is 258800991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22170 + ... + 66870.

It is an arithmetic number, because the mean of its divisors is an integer number (54312930).

Almost surely, 2^1990088520 is an apocalyptic number.

1990088520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990088520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3476027520).

1990088520 is an abundant number, since it is smaller than the sum of its proper divisors (4961966520).

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

1990088520 is a wasteful number, since it uses less digits than its factorization.

1990088520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44775 (or 44771 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 1990088520 is about 44610.4082025708. The cubic root of 1990088520 is about 1257.8363219217.

The spelling of 1990088520 in words is "one billion, nine hundred ninety million, eighty-eight thousand, five hundred twenty".