81928330970 has 16 divisors (see below), whose sum is σ = 149672056608. Its totient is φ = 32282207760.

The previous prime is 81928330963. The next prime is 81928331033. The reversal of 81928330970 is 7903382918.

It is a happy number.

It is a super-2 number, since 2×81928330970² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61139876 + ... + 61141215.

It is an arithmetic number, because the mean of its divisors is an integer number (9354503538).

Almost surely, 2^81928330970 is an apocalyptic number.

81928330970 is a deficient number, since it is larger than the sum of its proper divisors (67743725638).

81928330970 is a wasteful number, since it uses less digits than its factorization.

81928330970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122281165.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 81928330970 in words is "eighty-one billion, nine hundred twenty-eight million, three hundred thirty thousand, nine hundred seventy".