73121620 has 96 divisors (see below), whose sum is σ = 185544576. Its totient is φ = 23846400.

The previous prime is 73121617. The next prime is 73121663. The reversal of 73121620 is 2612137.

It is a super-2 number, since 2×73121620² = 10693542622848800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 73121591 and 73121600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105475 + ... + 106165.

It is an arithmetic number, because the mean of its divisors is an integer number (1932756).

Almost surely, 2^73121620 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 73121620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92772288).

73121620 is an abundant number, since it is smaller than the sum of its proper divisors (112422956).

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

73121620 is a wasteful number, since it uses less digits than its factorization.

73121620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 759 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 73121620 is about 8551.1180555527. The cubic root of 73121620 is about 418.1658873177.

Adding to 73121620 its reverse (2612137), we get a palindrome (75733757).

The spelling of 73121620 in words is "seventy-three million, one hundred twenty-one thousand, six hundred twenty".