73973520 has 160 divisors (see below), whose sum is σ = 266054400. Its totient is φ = 18855936.

The previous prime is 73973513. The next prime is 73973521. The reversal of 73973520 is 2537937.

It is a happy number.

It is a super-2 number, since 2×73973520² = 10944163322380800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (73973521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48936 + ... + 50424.

It is an arithmetic number, because the mean of its divisors is an integer number (1662840).

Almost surely, 2^73973520 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 73973520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133027200).

73973520 is an abundant number, since it is smaller than the sum of its proper divisors (192080880).

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

73973520 is a wasteful number, since it uses less digits than its factorization.

73973520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1522 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 36.

The square root of 73973520 is about 8600.7860105923. The cubic root of 73973520 is about 419.7835619518.

The spelling of 73973520 in words is "seventy-three million, nine hundred seventy-three thousand, five hundred twenty".