81960060 has 192 divisors, whose sum is σ = 299400192. Its totient is φ = 16257024.

The previous prime is 81960049. The next prime is 81960071. The reversal of 81960060 is 6006918.

It is an interprime number because it is at equal distance from previous prime (81960049) and next prime (81960071).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 92379 + ... + 93261.

It is an arithmetic number, because the mean of its divisors is an integer number (1559376).

Almost surely, 2^81960060 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81960060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149700096).

81960060 is an abundant number, since it is smaller than the sum of its proper divisors (217440132).

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

81960060 is a wasteful number, since it uses less digits than its factorization.

81960060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932 (or 930 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 81960060 is about 9053.1795519585. The cubic root of 81960060 is about 434.3776011093.

Adding to 81960060 its reverse (6006918), we get a palindrome (87966978).

The spelling of 81960060 in words is "eighty-one million, nine hundred sixty thousand, sixty".