74305781 has 4 divisors (see below), whose sum is σ = 81060864. Its totient is φ = 67550700.

The previous prime is 74305753. The next prime is 74305807. The reversal of 74305781 is 18750347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74305781 - 2⁶ = 74305717 is a prime.

It is a super-2 number, since 2×74305781² = 11042698180039922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74308781) 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, 3377525 + ... + 3377546.

It is an arithmetic number, because the mean of its divisors is an integer number (20265216).

Almost surely, 2^74305781 is an apocalyptic number.

It is an amenable number.

74305781 is a deficient number, since it is larger than the sum of its proper divisors (6755083).

74305781 is a wasteful number, since it uses less digits than its factorization.

74305781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755082.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 74305781 is about 8620.0801040362. The cubic root of 74305781 is about 420.4111261515.

The spelling of 74305781 in words is "seventy-four million, three hundred five thousand, seven hundred eighty-one".