81028706 has 16 divisors (see below), whose sum is σ = 132837408. Its totient is φ = 36763200.

The previous prime is 81028693. The next prime is 81028709. The reversal of 81028706 is 60782018.

It is not an unprimeable number, because it can be changed into a prime (81028709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9941 + ... + 16151.

It is an arithmetic number, because the mean of its divisors is an integer number (8302338).

Almost surely, 2^81028706 is an apocalyptic number.

81028706 is a deficient number, since it is larger than the sum of its proper divisors (51808702).

81028706 is a wasteful number, since it uses less digits than its factorization.

81028706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6817.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81028706 is about 9001.5946365075. The cubic root of 81028706 is about 432.7259776679.

The spelling of 81028706 in words is "eighty-one million, twenty-eight thousand, seven hundred six".