80438721 has 16 divisors (see below), whose sum is σ = 121037760. Its totient is φ = 47069120.

The previous prime is 80438719. The next prime is 80438741. The reversal of 80438721 is 12783408.

It is a cyclic number.

It is not a de Polignac number, because 80438721 - 2¹ = 80438719 is a prime.

It is a super-3 number, since 3×80438721³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (80438741) 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 15 ways as a sum of consecutive naturals, for example, 41070 + ... + 42983.

It is an arithmetic number, because the mean of its divisors is an integer number (7564860).

Almost surely, 2^80438721 is an apocalyptic number.

It is an amenable number.

80438721 is a deficient number, since it is larger than the sum of its proper divisors (40599039).

80438721 is a wasteful number, since it uses less digits than its factorization.

80438721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84096.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 80438721 is about 8968.7636271673. The cubic root of 80438721 is about 431.6731656437.

It can be divided in two parts, 804387 and 21, that added together give a palindrome (804408).

The spelling of 80438721 in words is "eighty million, four hundred thirty-eight thousand, seven hundred twenty-one".