72081612 has 18 divisors (see below), whose sum is σ = 182206388. Its totient is φ = 24027192.

The previous prime is 72081593. The next prime is 72081613. The reversal of 72081612 is 21618027.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (72081613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1001098 + ... + 1001169.

Almost surely, 2^72081612 is an apocalyptic number.

It is an amenable number.

72081612 is an abundant number, since it is smaller than the sum of its proper divisors (110124776).

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

72081612 is a wasteful number, since it uses less digits than its factorization.

72081612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002277 (or 2002272 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 72081612 is about 8490.0890454694. The cubic root of 72081612 is about 416.1738902589.

Adding to 72081612 its reverse (21618027), we get a palindrome (93699639).

The spelling of 72081612 in words is "seventy-two million, eighty-one thousand, six hundred twelve".