73405820 has 12 divisors (see below), whose sum is σ = 154152264. Its totient is φ = 29362320.

The previous prime is 73405793. The next prime is 73405823. The reversal of 73405820 is 2850437.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73405823) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1835126 + ... + 1835165.

It is an arithmetic number, because the mean of its divisors is an integer number (12846022).

Almost surely, 2^73405820 is an apocalyptic number.

It is an amenable number.

73405820 is an abundant number, since it is smaller than the sum of its proper divisors (80746444).

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

73405820 is a wasteful number, since it uses less digits than its factorization.

73405820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670300 (or 3670298 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 73405820 is about 8567.7196499419. The cubic root of 73405820 is about 418.7069453024.

The spelling of 73405820 in words is "seventy-three million, four hundred five thousand, eight hundred twenty".