73220820 has 24 divisors (see below), whose sum is σ = 205018464. Its totient is φ = 19525536.

The previous prime is 73220779. The next prime is 73220821. The reversal of 73220820 is 2802237.

It is a super-2 number, since 2×73220820² = 10722576962944800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73220821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610114 + ... + 610233.

It is an arithmetic number, because the mean of its divisors is an integer number (8542436).

Almost surely, 2^73220820 is an apocalyptic number.

It is an amenable number.

73220820 is an abundant number, since it is smaller than the sum of its proper divisors (131797644).

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

73220820 is a wasteful number, since it uses less digits than its factorization.

73220820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220359 (or 1220357 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 73220820 is about 8556.9165007028. The cubic root of 73220820 is about 418.3549026019.

The spelling of 73220820 in words is "seventy-three million, two hundred twenty thousand, eight hundred twenty".