80821500 has 48 divisors (see below), whose sum is σ = 235356576. Its totient is φ = 21552000.

The previous prime is 80821493. The next prime is 80821511. The reversal of 80821500 is 512808.

It is a super-2 number, since 2×80821500² = 13064229724500000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25441 + ... + 28440.

It is an arithmetic number, because the mean of its divisors is an integer number (4903262).

Almost surely, 2^80821500 is an apocalyptic number.

It is an amenable number.

80821500 is an abundant number, since it is smaller than the sum of its proper divisors (154535076).

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

80821500 is a wasteful number, since it uses less digits than its factorization.

80821500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53903 (or 53891 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 80821500 is about 8990.0778639565. The cubic root of 80821500 is about 432.3568082670.

The spelling of 80821500 in words is "eighty million, eight hundred twenty-one thousand, five hundred".