74405665 has 8 divisors (see below), whose sum is σ = 90750888. Its totient is φ = 58548480.

The previous prime is 74405663. The next prime is 74405701. The reversal of 74405665 is 56650447.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 239121 + 74166544 = 489^2 + 8612^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74405665 - 2¹ = 74405663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74405663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121672 + ... + 122281.

It is an arithmetic number, because the mean of its divisors is an integer number (11343861).

Almost surely, 2^74405665 is an apocalyptic number.

It is an amenable number.

74405665 is a deficient number, since it is larger than the sum of its proper divisors (16345223).

74405665 is a wasteful number, since it uses less digits than its factorization.

74405665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244019.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 74405665 is about 8625.8718399939. The cubic root of 74405665 is about 420.5994181104.

The spelling of 74405665 in words is "seventy-four million, four hundred five thousand, six hundred sixty-five".