81724932970 has 16 divisors (see below), whose sum is σ = 147664218240. Its totient is φ = 32565675664.

The previous prime is 81724932941. The next prime is 81724932977. The reversal of 81724932970 is 7923942718.

It is not an unprimeable number, because it can be changed into a prime (81724932977) 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, 15534430 + ... + 15539689.

It is an arithmetic number, because the mean of its divisors is an integer number (9229013640).

Almost surely, 2^81724932970 is an apocalyptic number.

81724932970 is a deficient number, since it is larger than the sum of its proper divisors (65939285270).

81724932970 is a wasteful number, since it uses less digits than its factorization.

81724932970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31074389.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 81724932970 in words is "eighty-one billion, seven hundred twenty-four million, nine hundred thirty-two thousand, nine hundred seventy".