80021788 has 144 divisors (see below), whose sum is σ = 198051840. Its totient is φ = 27417600.

The previous prime is 80021687. The next prime is 80021803. The reversal of 80021788 is 88712008.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2581333 + ... + 2581363.

It is an arithmetic number, because the mean of its divisors is an integer number (1375360).

Almost surely, 2^80021788 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 80021788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99025920).

80021788 is an abundant number, since it is smaller than the sum of its proper divisors (118030052).

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

80021788 is a wasteful number, since it uses less digits than its factorization.

80021788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 80021788 is about 8945.4898133082. The cubic root of 80021788 is about 430.9260518082.

The spelling of 80021788 in words is "eighty million, twenty-one thousand, seven hundred eighty-eight".