73213020 has 36 divisors (see below), whose sum is σ = 222080040. Its totient is φ = 19523424.

The previous prime is 73213009. The next prime is 73213031. The reversal of 73213020 is 2031237.

It is an interprime number because it is at equal distance from previous prime (73213009) and next prime (73213031).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 73212984 and 73213002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203190 + ... + 203549.

It is an arithmetic number, because the mean of its divisors is an integer number (6168890).

Almost surely, 2^73213020 is an apocalyptic number.

It is an amenable number.

73213020 is an abundant number, since it is smaller than the sum of its proper divisors (148867020).

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

73213020 is a wasteful number, since it uses less digits than its factorization.

73213020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406754 (or 406749 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 73213020 is about 8556.4607169086. The cubic root of 73213020 is about 418.3400466993.

Adding to 73213020 its reverse (2031237), we get a palindrome (75244257).

The spelling of 73213020 in words is "seventy-three million, two hundred thirteen thousand, twenty".