80440040 has 32 divisors (see below), whose sum is σ = 186831360. Its totient is φ = 31137600.

The previous prime is 80440037. The next prime is 80440043. The reversal of 80440040 is 4004408.

It is an interprime number because it is at equal distance from previous prime (80440037) and next prime (80440043).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 80439994 and 80440021.

It is not an unprimeable number, because it can be changed into a prime (80440043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31196 + ... + 33675.

It is an arithmetic number, because the mean of its divisors is an integer number (5838480).

Almost surely, 2^80440040 is an apocalyptic number.

It is an amenable number.

80440040 is an abundant number, since it is smaller than the sum of its proper divisors (106391320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80440040 is a wasteful number, since it uses less digits than its factorization.

80440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64913 (or 64909 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 80440040 is about 8968.8371598552. The cubic root of 80440040 is about 431.6755250953.

Adding to 80440040 its reverse (4004408), we get a palindrome (84444448).

The spelling of 80440040 in words is "eighty million, four hundred forty thousand, forty".