81288570 has 32 divisors (see below), whose sum is σ = 212829120. Its totient is φ = 19706240.

The previous prime is 81288569. The next prime is 81288583. The reversal of 81288570 is 7588218.

It is a super-2 number, since 2×81288570² = 13215663225289800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122835 + ... + 123494.

It is an arithmetic number, because the mean of its divisors is an integer number (6650910).

Almost surely, 2^81288570 is an apocalyptic number.

81288570 is an abundant number, since it is smaller than the sum of its proper divisors (131540550).

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

81288570 is a wasteful number, since it uses less digits than its factorization.

81288570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246350.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 81288570 is about 9016.0174134703. The cubic root of 81288570 is about 433.1880768897.

The spelling of 81288570 in words is "eighty-one million, two hundred eighty-eight thousand, five hundred seventy".