73091780 has 24 divisors (see below), whose sum is σ = 154028952. Its totient is φ = 29134592.

The previous prime is 73091779. The next prime is 73091783. The reversal of 73091780 is 8719037.

73091780 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30294016 + 42797764 = 5504^2 + 6542^2 .

73091780 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 73091780.

It is not an unprimeable number, because it can be changed into a prime (73091783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377 + ... + 12096.

It is an arithmetic number, because the mean of its divisors is an integer number (6417873).

Almost surely, 2^73091780 is an apocalyptic number.

It is an amenable number.

73091780 is an abundant number, since it is smaller than the sum of its proper divisors (80937172).

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

73091780 is a wasteful number, since it uses less digits than its factorization.

73091780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12775 (or 12773 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 73091780 is about 8549.3730764308. The cubic root of 73091780 is about 418.1089968575.

The spelling of 73091780 in words is "seventy-three million, ninety-one thousand, seven hundred eighty".