80521720 has 16 divisors (see below), whose sum is σ = 181173960. Its totient is φ = 32208672.

The previous prime is 80521711. The next prime is 80521733. The reversal of 80521720 is 2712508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006482 + ... + 1006561.

Almost surely, 2^80521720 is an apocalyptic number.

It is an amenable number.

80521720 is an abundant number, since it is smaller than the sum of its proper divisors (100652240).

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

80521720 is a wasteful number, since it uses less digits than its factorization.

80521720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013054 (or 2013050 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 80521720 is about 8973.3895491057. The cubic root of 80521720 is about 431.8215855620.

The spelling of 80521720 in words is "eighty million, five hundred twenty-one thousand, seven hundred twenty".