80637840 has 60 divisors (see below), whose sum is σ = 270811164. Its totient is φ = 21503232.

The previous prime is 80637811. The next prime is 80637863. The reversal of 80637840 is 4873608.

It can be written as a sum of positive squares in 2 ways, for example, as 60279696 + 20358144 = 7764^2 + 4512^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×80637840² = 13004922479731200, which contains 22 as substring.

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 = 80637795 and 80637804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55279 + ... + 56718.

Almost surely, 2^80637840 is an apocalyptic number.

80637840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80637840 is an abundant number, since it is smaller than the sum of its proper divisors (190173324).

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

80637840 is a wasteful number, since it uses less digits than its factorization.

80637840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112016 (or 112007 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 80637840 is about 8979.8574598932. The cubic root of 80637840 is about 432.0290618309.

The spelling of 80637840 in words is "eighty million, six hundred thirty-seven thousand, eight hundred forty".