72031340 has 12 divisors (see below), whose sum is σ = 151265856. Its totient is φ = 28812528.

The previous prime is 72031339. The next prime is 72031367. The reversal of 72031340 is 4313027.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 3601567 = 72031340 / (7 + 2 + 0 + 3 + 1 + 3 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800764 + ... + 1800803.

It is an arithmetic number, because the mean of its divisors is an integer number (12605488).

Almost surely, 2^72031340 is an apocalyptic number.

It is an amenable number.

72031340 is an abundant number, since it is smaller than the sum of its proper divisors (79234516).

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

72031340 is a wasteful number, since it uses less digits than its factorization.

72031340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601576 (or 3601574 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 72031340 is about 8487.1279005327. The cubic root of 72031340 is about 416.0771168055.

Adding to 72031340 its reverse (4313027), we get a palindrome (76344367).

The spelling of 72031340 in words is "seventy-two million, thirty-one thousand, three hundred forty".