81370320030 has 48 divisors (see below), whose sum is σ = 211650074064. Its totient is φ = 21689804160.

The previous prime is 81370320019. The next prime is 81370320041. The reversal of 81370320030 is 3002307318.

It is an interprime number because it is at equal distance from previous prime (81370320019) and next prime (81370320041).

It is a super-2 number, since 2×81370320030² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81370319976 and 81370320003.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 34497 + ... + 404883.

It is an arithmetic number, because the mean of its divisors is an integer number (4409376543).

Almost surely, 2^81370320030 is an apocalyptic number.

81370320030 is an abundant number, since it is smaller than the sum of its proper divisors (130279754034).

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

81370320030 is a wasteful number, since it uses less digits than its factorization.

81370320030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372841 (or 372838 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

Adding to 81370320030 its reverse (3002307318), we get a palindrome (84372627348).

The spelling of 81370320030 in words is "eighty-one billion, three hundred seventy million, three hundred twenty thousand, thirty".