73745281 has 4 divisors (see below), whose sum is σ = 73762564. Its totient is φ = 73728000.

The previous prime is 73745267. The next prime is 73745293. The reversal of 73745281 is 18254737.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18254737 = 53 ⋅344429.

It can be written as a sum of positive squares in 2 ways, for example, as 54464400 + 19280881 = 7380^2 + 4391^2 .

It is a 3-Lehmer number, since φ(73745281) divides (73745281-1)³.

It is a cyclic number.

It is not a de Polignac number, because 73745281 - 2¹¹ = 73743233 is a prime.

It is a super-2 number, since 2×73745281² = 10876732939537922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73745281.

It is not an unprimeable number, because it can be changed into a prime (73745261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2881 + ... + 12481.

It is an arithmetic number, because the mean of its divisors is an integer number (18440641).

Almost surely, 2^73745281 is an apocalyptic number.

It is an amenable number.

73745281 is a deficient number, since it is larger than the sum of its proper divisors (17283).

73745281 is an equidigital number, since it uses as much as digits as its factorization.

73745281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17282.

The product of its digits is 47040, while the sum is 37.

The square root of 73745281 is about 8587.5072634613. The cubic root of 73745281 is about 419.3513816774.

The spelling of 73745281 in words is "seventy-three million, seven hundred forty-five thousand, two hundred eighty-one".