80505740 has 96 divisors (see below), whose sum is σ = 203212800. Its totient is φ = 26208000.

The previous prime is 80505697. The next prime is 80505749. The reversal of 80505740 is 4750508.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (80505749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320615 + ... + 320865.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^80505740 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 80505740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101606400).

80505740 is an abundant number, since it is smaller than the sum of its proper divisors (122707060).

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

80505740 is a wasteful number, since it uses less digits than its factorization.

80505740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 80505740 is about 8972.4990944552. The cubic root of 80505740 is about 431.7930178436.

The spelling of 80505740 in words is "eighty million, five hundred five thousand, seven hundred forty".