809055990 has 24 divisors (see below), whose sum is σ = 2103545808. Its totient is φ = 215748240.

The previous prime is 809055941. The next prime is 809055991. The reversal of 809055990 is 99550908.

809055990 is a `hidden beast` number, since 8 + 0 + 9 + 0 + 559 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809055991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4494666 + ... + 4494845.

It is an arithmetic number, because the mean of its divisors is an integer number (87647742).

Almost surely, 2^809055990 is an apocalyptic number.

809055990 is an abundant number, since it is smaller than the sum of its proper divisors (1294489818).

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

809055990 is a wasteful number, since it uses less digits than its factorization.

809055990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8989524 (or 8989521 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The square root of 809055990 is about 28443.9095414115. The cubic root of 809055990 is about 931.8074803278.

The spelling of 809055990 in words is "eight hundred nine million, fifty-five thousand, nine hundred ninety".