801609990 has 64 divisors (see below), whose sum is σ = 1962731520. Its totient is φ = 209468160.

The previous prime is 801609989. The next prime is 801610003. The reversal of 801609990 is 99906108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 808395 + ... + 809385.

It is an arithmetic number, because the mean of its divisors is an integer number (30667680).

Almost surely, 2^801609990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 801609990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (981365760).

801609990 is an abundant number, since it is smaller than the sum of its proper divisors (1161121530).

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

801609990 is a wasteful number, since it uses less digits than its factorization.

801609990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 801609990 is about 28312.7178137317. The cubic root of 801609990 is about 928.9400920689.

The spelling of 801609990 in words is "eight hundred one million, six hundred nine thousand, nine hundred ninety".