80421745 has 4 divisors (see below), whose sum is σ = 96506100. Its totient is φ = 64337392.

The previous prime is 80421743. The next prime is 80421797. The reversal of 80421745 is 54712408.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20684304 + 59737441 = 4548^2 + 7729^2 .

It is a cyclic number.

It is not a de Polignac number, because 80421745 - 2¹ = 80421743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80421743) 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 3 ways as a sum of consecutive naturals, for example, 8042170 + ... + 8042179.

It is an arithmetic number, because the mean of its divisors is an integer number (24126525).

Almost surely, 2^80421745 is an apocalyptic number.

It is an amenable number.

80421745 is a deficient number, since it is larger than the sum of its proper divisors (16084355).

80421745 is a wasteful number, since it uses less digits than its factorization.

80421745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16084354.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 80421745 is about 8967.8171814550. The cubic root of 80421745 is about 431.6427963591.

The spelling of 80421745 in words is "eighty million, four hundred twenty-one thousand, seven hundred forty-five".