81015080 has 16 divisors (see below), whose sum is σ = 182284020. Its totient is φ = 32406016.

The previous prime is 81015073. The next prime is 81015101. The reversal of 81015080 is 8051018.

It can be written as a sum of positive squares in 2 ways, for example, as 80964004 + 51076 = 8998^2 + 226^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1012649 + ... + 1012728.

Almost surely, 2^81015080 is an apocalyptic number.

It is an amenable number.

81015080 is an abundant number, since it is smaller than the sum of its proper divisors (101268940).

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

81015080 is a wasteful number, since it uses less digits than its factorization.

81015080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025388 (or 2025384 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 81015080 is about 9000.8377387885. The cubic root of 81015080 is about 432.7017201959.

Adding to 81015080 its reverse (8051018), we get a palindrome (89066098).

The spelling of 81015080 in words is "eighty-one million, fifteen thousand, eighty".