80019900 has 216 divisors, whose sum is σ = 270138960. Its totient is φ = 20528640.

The previous prime is 80019893. The next prime is 80019941. The reversal of 80019900 is 991008.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 899056 + ... + 899144.

Almost surely, 2^80019900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80019900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135069480).

80019900 is an abundant number, since it is smaller than the sum of its proper divisors (190119060).

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

80019900 is a wasteful number, since it uses less digits than its factorization.

80019900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 80019900 is about 8945.3842846465. The cubic root of 80019900 is about 430.9226627530.

The spelling of 80019900 in words is "eighty million, nineteen thousand, nine hundred".