80440681 has 4 divisors (see below), whose sum is σ = 81054864. Its totient is φ = 79826500.

The previous prime is 80440673. The next prime is 80440747. The reversal of 80440681 is 18604408.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80440681 - 2³ = 80440673 is a prime.

It is a super-2 number, since 2×80440681² = 12941406319487522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80440621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306895 + ... + 307156.

It is an arithmetic number, because the mean of its divisors is an integer number (20263716).

Almost surely, 2^80440681 is an apocalyptic number.

It is an amenable number.

80440681 is a deficient number, since it is larger than the sum of its proper divisors (614183).

80440681 is a wasteful number, since it uses less digits than its factorization.

80440681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614182.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 80440681 is about 8968.8728946284. The cubic root of 80440681 is about 431.6766717186.

The spelling of 80440681 in words is "eighty million, four hundred forty thousand, six hundred eighty-one".