80640441 has 20 divisors (see below), whose sum is σ = 137672832. Its totient is φ = 46079928.

The previous prime is 80640431. The next prime is 80640449. The reversal of 80640441 is 14404608.

It is not a de Polignac number, because 80640441 - 2⁹ = 80639929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (80640449) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 70545 + ... + 71678.

Almost surely, 2^80640441 is an apocalyptic number.

80640441 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

80640441 is a deficient number, since it is larger than the sum of its proper divisors (57032391).

80640441 is a wasteful number, since it uses less digits than its factorization.

80640441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142242 (or 142233 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 80640441 is about 8980.0022828505. The cubic root of 80640441 is about 432.0337068607.

The spelling of 80640441 in words is "eighty million, six hundred forty thousand, four hundred forty-one".