73655220 has 48 divisors (see below), whose sum is σ = 218369088. Its totient is φ = 18485760.

The previous prime is 73655209. The next prime is 73655221. The reversal of 73655220 is 2255637.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73655221) 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, 35086 + ... + 37125.

It is an arithmetic number, because the mean of its divisors is an integer number (4549356).

Almost surely, 2^73655220 is an apocalyptic number.

It is an amenable number.

73655220 is an abundant number, since it is smaller than the sum of its proper divisors (144713868).

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

73655220 is a wasteful number, since it uses less digits than its factorization.

73655220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72240 (or 72238 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 73655220 is about 8582.2619396054. The cubic root of 73655220 is about 419.1806019834.

The spelling of 73655220 in words is "seventy-three million, six hundred fifty-five thousand, two hundred twenty".