80435721 has 16 divisors (see below), whose sum is σ = 119534400. Its totient is φ = 47812608.

The previous prime is 80435701. The next prime is 80435767. The reversal of 80435721 is 12753408.

It is not a de Polignac number, because 80435721 - 2¹⁴ = 80419337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80435701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40536 + ... + 42473.

It is an arithmetic number, because the mean of its divisors is an integer number (7470900).

Almost surely, 2^80435721 is an apocalyptic number.

It is an amenable number.

80435721 is a deficient number, since it is larger than the sum of its proper divisors (39098679).

80435721 is a wasteful number, since it uses less digits than its factorization.

80435721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83048.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 80435721 is about 8968.5963784753. The cubic root of 80435721 is about 431.6677990923.

The spelling of 80435721 in words is "eighty million, four hundred thirty-five thousand, seven hundred twenty-one".