73281380 has 12 divisors (see below), whose sum is σ = 153890940. Its totient is φ = 29312544.

The previous prime is 73281367. The next prime is 73281389. The reversal of 73281380 is 8318237.

It can be written as a sum of positive squares in 2 ways, for example, as 7606564 + 65674816 = 2758^2 + 8104^2 .

It is not an unprimeable number, because it can be changed into a prime (73281389) 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, 1832015 + ... + 1832054.

It is an arithmetic number, because the mean of its divisors is an integer number (12824245).

Almost surely, 2^73281380 is an apocalyptic number.

It is an amenable number.

73281380 is an abundant number, since it is smaller than the sum of its proper divisors (80609560).

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

73281380 is a wasteful number, since it uses less digits than its factorization.

73281380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664078 (or 3664076 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 73281380 is about 8560.4544271902. The cubic root of 73281380 is about 418.4702094741.

The spelling of 73281380 in words is "seventy-three million, two hundred eighty-one thousand, three hundred eighty".