73909780 has 48 divisors (see below), whose sum is σ = 179174016. Its totient is φ = 25084800.

The previous prime is 73909747. The next prime is 73909789. The reversal of 73909780 is 8790937.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73909789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11527 + ... + 16753.

It is an arithmetic number, because the mean of its divisors is an integer number (3732792).

Almost surely, 2^73909780 is an apocalyptic number.

73909780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73909780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89587008).

73909780 is an abundant number, since it is smaller than the sum of its proper divisors (105264236).

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

73909780 is a wasteful number, since it uses less digits than its factorization.

73909780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5344 (or 5342 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 73909780 is about 8597.0797367478. The cubic root of 73909780 is about 419.6629571144.

The spelling of 73909780 in words is "seventy-three million, nine hundred nine thousand, seven hundred eighty".