73161240 has 128 divisors (see below), whose sum is σ = 230584320. Its totient is φ = 18547200.

The previous prime is 73161227. The next prime is 73161259. The reversal of 73161240 is 4216137.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 73161240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263982 + ... + 264258.

It is an arithmetic number, because the mean of its divisors is an integer number (1801440).

Almost surely, 2^73161240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73161240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115292160).

73161240 is an abundant number, since it is smaller than the sum of its proper divisors (157423080).

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

73161240 is a wasteful number, since it uses less digits than its factorization.

73161240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 73161240 is about 8553.4343979480. The cubic root of 73161240 is about 418.2413995990.

Adding to 73161240 its reverse (4216137), we get a palindrome (77377377).

The spelling of 73161240 in words is "seventy-three million, one hundred sixty-one thousand, two hundred forty".