72032981 has 4 divisors (see below), whose sum is σ = 72060000. Its totient is φ = 72005964.

The previous prime is 72032963. The next prime is 72032993. The reversal of 72032981 is 18923027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18923027 = 3917 ⋅4831.

It is a cyclic number.

It is not a de Polignac number, because 72032981 - 2¹⁸ = 71770837 is a prime.

It is a super-2 number, since 2×72032981² = 10377500703492722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72034981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9011 + ... + 15008.

It is an arithmetic number, because the mean of its divisors is an integer number (18015000).

Almost surely, 2^72032981 is an apocalyptic number.

It is an amenable number.

72032981 is a deficient number, since it is larger than the sum of its proper divisors (27019).

72032981 is a wasteful number, since it uses less digits than its factorization.

72032981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27018.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 72032981 is about 8487.2245757963. The cubic root of 72032981 is about 416.0802764365.

The spelling of 72032981 in words is "seventy-two million, thirty-two thousand, nine hundred eighty-one".