80799840 has 144 divisors (see below), whose sum is σ = 300854736. Its totient is φ = 19584000.

The previous prime is 80799833. The next prime is 80799841. The reversal of 80799840 is 4899708.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×80799840² = 13057228288051200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80799841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13290 + ... + 18390.

It is an arithmetic number, because the mean of its divisors is an integer number (2089269).

Almost surely, 2^80799840 is an apocalyptic number.

80799840 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 80799840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150427368).

80799840 is an abundant number, since it is smaller than the sum of its proper divisors (220054896).

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

80799840 is a wasteful number, since it uses less digits than its factorization.

80799840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133 (or 5122 counting only the distinct ones).

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

The square root of 80799840 is about 8988.8731218101. The cubic root of 80799840 is about 432.3181812301.

The spelling of 80799840 in words is "eighty million, seven hundred ninety-nine thousand, eight hundred forty".