73213720 has 16 divisors (see below), whose sum is σ = 164730960. Its totient is φ = 29285472.

The previous prime is 73213703. The next prime is 73213753. The reversal of 73213720 is 2731237.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915132 + ... + 915211.

It is an arithmetic number, because the mean of its divisors is an integer number (10295685).

Almost surely, 2^73213720 is an apocalyptic number.

It is an amenable number.

73213720 is an abundant number, since it is smaller than the sum of its proper divisors (91517240).

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

73213720 is a wasteful number, since it uses less digits than its factorization.

73213720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830354 (or 1830350 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 73213720 is about 8556.5016215741. The cubic root of 73213720 is about 418.3413799644.

Adding to 73213720 its reverse (2731237), we get a palindrome (75944957).

The spelling of 73213720 in words is "seventy-three million, two hundred thirteen thousand, seven hundred twenty".