73845720 has 192 divisors, whose sum is σ = 267321600. Its totient is φ = 17556480.

The previous prime is 73845719. The next prime is 73845721. The reversal of 73845720 is 2754837.

73845720 is a `hidden beast` number, since 7 + 3 + 84 + 572 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (73845719) and next prime (73845721).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73845721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144826 + ... + 145334.

It is an arithmetic number, because the mean of its divisors is an integer number (1392300).

Almost surely, 2^73845720 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 73845720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133660800).

73845720 is an abundant number, since it is smaller than the sum of its proper divisors (193475880).

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

73845720 is a wasteful number, since it uses less digits than its factorization.

73845720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 73845720 is about 8593.3532453868. The cubic root of 73845720 is about 419.5416769097.

The spelling of 73845720 in words is "seventy-three million, eight hundred forty-five thousand, seven hundred twenty".