81937469000 has 32 divisors (see below), whose sum is σ = 191733679800. Its totient is φ = 32774987200.

The previous prime is 81937468997. The next prime is 81937469021. The reversal of 81937469000 is 96473918.

It can be written as a sum of positive squares in 4 ways, for example, as 53793380356 + 28144088644 = 231934^2 + 167762^2 .

It is a super-2 number, since 2×81937469000² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40967735 + ... + 40969734.

Almost surely, 2^81937469000 is an apocalyptic number.

It is an amenable number.

81937469000 is an abundant number, since it is smaller than the sum of its proper divisors (109796210800).

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

81937469000 is a wasteful number, since it uses less digits than its factorization.

81937469000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81937490 (or 81937476 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 81937469000 in words is "eighty-one billion, nine hundred thirty-seven million, four hundred sixty-nine thousand".