81024690 has 16 divisors (see below), whose sum is σ = 194459328. Its totient is φ = 21606576.

The previous prime is 81024659. The next prime is 81024701. The reversal of 81024690 is 9642018.

It is a super-2 number, since 2×81024690² = 13130000779192200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2700823 = 81024690 / (8 + 1 + 0 + 2 + 4 + 6 + 9 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1350382 + ... + 1350441.

It is an arithmetic number, because the mean of its divisors is an integer number (12153708).

Almost surely, 2^81024690 is an apocalyptic number.

81024690 is an abundant number, since it is smaller than the sum of its proper divisors (113434638).

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

81024690 is a wasteful number, since it uses less digits than its factorization.

81024690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700833.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81024690 is about 9001.3715621565. The cubic root of 81024690 is about 432.7188285298.

The spelling of 81024690 in words is "eighty-one million, twenty-four thousand, six hundred ninety".