74045781 has 6 divisors (see below), whose sum is σ = 106955030. Its totient is φ = 49363848.

The previous prime is 74045759. The next prime is 74045791. The reversal of 74045781 is 18754047.

It can be written as a sum of positive squares in only one way, i.e., 60606225 + 13439556 = 7785^2 + 3666^2 .

It is not a de Polignac number, because 74045781 - 2¹¹ = 74043733 is a prime.

It is a super-2 number, since 2×74045781² = 10965555367799922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74045791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4113646 + ... + 4113663.

Almost surely, 2^74045781 is an apocalyptic number.

It is an amenable number.

74045781 is a deficient number, since it is larger than the sum of its proper divisors (32909249).

74045781 is a wasteful number, since it uses less digits than its factorization.

74045781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8227315 (or 8227312 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 74045781 is about 8604.9858221847. The cubic root of 74045781 is about 419.9202059296.

The spelling of 74045781 in words is "seventy-four million, forty-five thousand, seven hundred eighty-one".