80965440 has 112 divisors (see below), whose sum is σ = 285658560. Its totient is φ = 21588480.

The previous prime is 80965439. The next prime is 80965471. The reversal of 80965440 is 4456908.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 80965395 and 80965404.

It is a congruent number.

It is an unprimeable number.

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, 3955 + ... + 13325.

Almost surely, 2^80965440 is an apocalyptic number.

80965440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80965440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142829280).

80965440 is an abundant number, since it is smaller than the sum of its proper divisors (204693120).

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

80965440 is a wasteful number, since it uses less digits than its factorization.

80965440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9397 (or 9381 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 80965440 is about 8998.0797951563. The cubic root of 80965440 is about 432.6133263567.

Adding to 80965440 its product of nonzero digits (34560), we get a square (81000000 = 9000²).

The spelling of 80965440 in words is "eighty million, nine hundred sixty-five thousand, four hundred forty".