80400440 has 64 divisors (see below), whose sum is σ = 186550560. Its totient is φ = 31173120.

The previous prime is 80400431. The next prime is 80400443. The reversal of 80400440 is 4400408.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80400443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202322 + ... + 202718.

Almost surely, 2^80400440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80400440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93275280).

80400440 is an abundant number, since it is smaller than the sum of its proper divisors (106150120).

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

80400440 is a wasteful number, since it uses less digits than its factorization.

80400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 548 counting only the distinct ones).

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

The square root of 80400440 is about 8966.6292440359. The cubic root of 80400440 is about 431.6046766443.

Adding to 80400440 its reverse (4400408), we get a palindrome (84800848).

The spelling of 80400440 in words is "eighty million, four hundred thousand, four hundred forty".