80997840 has 320 divisors, whose sum is σ = 348549120. Its totient is φ = 16796160.

The previous prime is 80997769. The next prime is 80997869. The reversal of 80997840 is 4879908.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 166077 + ... + 166563.

It is an arithmetic number, because the mean of its divisors is an integer number (1089216).

Almost surely, 2^80997840 is an apocalyptic number.

80997840 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 80997840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174274560).

80997840 is an abundant number, since it is smaller than the sum of its proper divisors (267551280).

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

80997840 is a wasteful number, since it uses less digits than its factorization.

80997840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 80997840 is about 8999.8799992000. The cubic root of 80997840 is about 432.6710250592.

It can be divided in two parts, 809978 and 40, that added together give a palindrome (810018).

The spelling of 80997840 in words is "eighty million, nine hundred ninety-seven thousand, eight hundred forty".