73553820 has 24 divisors (see below), whose sum is σ = 205950864. Its totient is φ = 19614336.

The previous prime is 73553813. The next prime is 73553863. The reversal of 73553820 is 2835537.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612889 + ... + 613008.

It is an arithmetic number, because the mean of its divisors is an integer number (8581286).

Almost surely, 2^73553820 is an apocalyptic number.

It is an amenable number.

73553820 is an abundant number, since it is smaller than the sum of its proper divisors (132397044).

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

73553820 is a wasteful number, since it uses less digits than its factorization.

73553820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225909 (or 1225907 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 73553820 is about 8576.3523714922. The cubic root of 73553820 is about 418.9881538299.

It can be divided in two parts, 7355 and 3820, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 73553820 in words is "seventy-three million, five hundred fifty-three thousand, eight hundred twenty".