80136720 has 60 divisors (see below), whose sum is σ = 269128236. Its totient is φ = 21369600.

The previous prime is 80136713. The next prime is 80136743. The reversal of 80136720 is 2763108.

It can be written as a sum of positive squares in 2 ways, for example, as 53758224 + 26378496 = 7332^2 + 5136^2 .

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

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, 54931 + ... + 56370.

Almost surely, 2^80136720 is an apocalyptic number.

80136720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80136720 is an abundant number, since it is smaller than the sum of its proper divisors (188991516).

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

80136720 is a wasteful number, since it uses less digits than its factorization.

80136720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111320 (or 111311 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 80136720 is about 8951.9115277129. The cubic root of 80136720 is about 431.1322602332.

Adding to 80136720 its reverse (2763108), we get a palindrome (82899828).

The spelling of 80136720 in words is "eighty million, one hundred thirty-six thousand, seven hundred twenty".