80640531 has 12 divisors (see below), whose sum is σ = 116756640. Its totient is φ = 53633040.

The previous prime is 80640499. The next prime is 80640569. The reversal of 80640531 is 13504608.

It is not a de Polignac number, because 80640531 - 2⁵ = 80640499 is a prime.

It is a super-2 number, since 2×80640531² = 13005790479923922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 80640495 and 80640504.

It is not an unprimeable number, because it can be changed into a prime (80640031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6516 + ... + 14273.

It is an arithmetic number, because the mean of its divisors is an integer number (9729720).

Almost surely, 2^80640531 is an apocalyptic number.

80640531 is a deficient number, since it is larger than the sum of its proper divisors (36116109).

80640531 is a wasteful number, since it uses less digits than its factorization.

80640531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21226 (or 21223 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 80640531 is about 8980.0072939837. The cubic root of 80640531 is about 432.0338675866.

The spelling of 80640531 in words is "eighty million, six hundred forty thousand, five hundred thirty-one".